E28 M5
  History
Production Data
Drivetrain
Chassis
Cosmetics
Special Versions
Colors and Upholstery
   
 
Production Versions
DC91: European-spec (LHD, non-catalyst), 10/1984 through 09/1987
DC92: European-spec (RHD, non-catalyst), 03/1986 through 11/1987
DC93: North American-spec (LHD, catalyst), 11/1986 through 11/1987
DC93: Japan-spec (LHD, catalyst), 01/1987 through 03/1987
DC98: South African-spec (RHD, non-catalyst), 06/1987 through 11/1988
   
History
What makes the E28 M5 unique?
The E28 M5 is the BMW Motorsport-developed version of the E28 5 Series. It uses the M88 or S38 twin-cam 24-valve inline-six first introduced in the M1. It also has a BMW Motorsport-tuned chassis and a few special cosmetic pieces.
Where was the E28 M5 first introduced?
The M5 debuted at the 1985 Amsterdam Motor Show.
Where was the E28 M5 built?
Unlike the other E28 5 Series models, M5s were assembled by a small group of BMW Motorsport technicians who mated the drivetrain and interior trim with pre-painted bodies transported from the Dingolfing factory. This hand-assembly took place in one of two facilities, depending on the production date. E28 M5s produced before September of 1986 were assembled at BMW Motorsport's original Preussenstrasse location near the BMW AG headquarters in Munich, while E28 M5s built beginning in 9/86 were assembled at the newly-opened BMW Motorsport headquarters in Garching, roughly 100 kms (60 miles) east of Munich. The only exceptions were M5s produced for the South African market, all of which were assembled at BMW's Rosslyn, South Africa factory from German-supplied Complete Knock Down (CKD) kits.
Why was BMW sued by American E28 M5 owners?
When BMW of North America first anounced the E28 M5 in late 1986, production was said to be limited to 500 cars. This same production limit was also specifically mentioned in the original U.S.-market sales brochure. By the time production of the E28 M5 ended in November of 1987, however, over 1,200 examples had been produced for the U.S. market. Thus, a class action lawsuit was filed against BMW of North America in 1991 by E28 M5 owners who claimed that the collector's value of their cars was diminished by the greater volume. The company settled the case by giving E28 M5 owners a $4,000 certificate (transferable to anyone) that could be applied towards the purchase or lease of a new BMW.
Why are all North American-spec E28 M5s officially 1988 models if the last example was made in 1987?
This was most likely a marketing decision. With the M5 originally intended to be a limited edition of 500 cars, and with the entire E28 range due to be replaced by the E34 for 1989, perhaps BMW of North America wanted to keep the E28 M5 exclusive by offering it only for the final 1988 model year. Also, it is worth noting that production of the other 1988 5 Series models began in early 1987, so the M5 preceeded these by only a few months.
Why are all North American E28 M5s essentially identical?
Because the E28 M5 was hand-assembled, yet needed to be manufactured for the North American market in relatively large numbers within a relatively short amount of time, BMW of North America was forced to limit the model's specification to just two color schemes: Black (086) with a Natur (tan) leather interior and (officially for Canada only) Black (086) with a black leather interior.
Why is a North American E28 M5 with a black leather interior so rare?
Though a Natur (tan) extended leather interior was the only official interior color choice for the U.S. market, Canada insisited on giving E28 M5 buyers the second option of a black extended leather interior. The black interior option was later expanded to the U.S. market at the very end of E28 M5 production. In total, 101 E28 M5s with a black interior were produced for North America, of which 71 were built to Canadian specification and the rest to U.S. specification.
Production Data
How many versions of the E28 M5 were developed?
BMW Motorsport built five different versions of the E28 M5. European-spec models were offered in both left-hand drive (DC91) and right-hand drive (DC92) configurations, all equipped with the non-catalyst M88 powerplant. In addition, E28 M5s powered by the catalyst-equipped S38 motor were offered in both North America and Japan, exclusively in left-hand drive form, and these all carried the DC93 model designation. Finally, a small batch of right-hand drive E28 M5s with the non-catalyst M88 engine were assembled in South Africa from Complete Knock Down (CKD) kits and sold locally under the DC98 model code.
How many of each version were produced?
ECE (LHD without catalyst): 588 produced from 10/1984 through 09/1987
ECE (RHD without catalyst): 187 produced from 03/1986 through 11/1987
NA (LHD with catalyst): 1,340 produced from 11/1986 through 11/1987
JAPAN (LHD with catalyst): 30 produced from 01/1987 through 03/1987
SA (RHD without catalyst): 96 produced (assembled from CKD kits) from 06/1987 through 11/1988*
*Dates shown indicate final completion of vehicles assmebled in Rosslyn, South Africa.
What changes were made to the E28 M5 during its production?
Though all North American-spec E28 M5s are essentially identical, there were some alterations to the European-spec E28 M5 that occurred over the course of its production. These include:
-Introduction of optional (standard in France and Spain) M-Technic aero package (9/85 production)
-Introduction of optional power operation for sport seats (9/85 production)
-Introduction of optional BMW Sound System (11/85 production)
-Introduction of optional driver-side airbag (11/85 production)
-Introduction of different rear springs (2/86 production)
- "M" shift knob lapel (shift pattern sticker on ashtray lid) changed to lapel with shift pattern and Motorsport stripe (4/86 production)
-Power windows (front and rear) included as standard equipment (4/86 production)
-On board computer included as standard equipment (4/86 production)
-Introduction of optional Shadowline (dechromed) exterior trim (4/86 production)
-Introduction of optional (standard on DC92 models from start of production) 16-inch cross-spoke alloy wheels (5/86 production)
-Introduction of door sill plates with the "M5" logo (10/86 production)
-Introduction of Boge (in place of of Bilstein) shocks (10/86 production)
-Introduction of 25mm (front) and 18mm (rear) anti-roll bars (10/86 production)
-Introduction of map lights in rear-view mirror (3/87 production)
Does every example of the E28 M5 utilize a "WBS" VIN prefix?
Starting with the E28 M5, all products from BMW Motorsport GmbH were assigned a "WBS" VIN prefix to distinguish them from the non-M BMW AG vehicles, which retained a "WBA" prefix. However, the first 26 left-hand drive ECE examples of the E28 M5 were produced with the regular WBA prefix.
Why do most sources list the total production of North American-spec M5s at 1,370 instead of 1,340?
Though it is true that BMW Motorsport produced 1,370 examples of the DC93 version of the E28 M5, this figure is rather misleading because it actually encompasses all E28 M5s produced for the USA, Canadian and Japanese markets. If you subtract the 30 examples produced for Japan (which differ rather extensively from those produced for the USA and Canada, despite sharing the same VIN sequence), then the total for North America is actually 1,340 units.
Of the 1,340 North American-spec E28 M5s, how many were built to Canadian specification?
A total of 101 E28 M5s were built to Canadian specification, while the remaining 1,239 were built to U.S. specs. Aside from minor differences in instrumentation (imperial versus metric), U.S. and Canadian E28 M5s are identical.
Drivetrain
What makes the M88/S38 engine unique?
The M88 and S38 engines are evolutions of the 24-valve inline-six developed for the mid-engine M1 supercar. Like that engine, both the M88 and S38 share a displacement of 3,453cc (via a bore of 93.4mm and a stroke of 84mm), and both have a four-valve crossflow cylinder head (with 37mm inlet valves and 32mm exhaust valves) designed for better breathing at high rpm. However, for their application in the M5, the M88 and S38 have wet-sump lubrication, specific pistons and connecting rods, as well as more advanced Bosch Motronic fuel injection/engine management.
How do the M88 and S38 engines differ?
The M88 is the non-catalyst version of the S38 engine. With a 10.5:1 compression ratio, 264-degree camshafts, equal-length exhaust headers and a single-row timing chain, it is identical to the one found in the non-catalyst versions of the E24 M635CSi coupe. Power is rated at 286 hp (DIN) at 6,500 rpm with 251 lb/ft of torque at 4,500 rpm. The M88 can be identified by the BMW Roundel and only the words “M Power" on its valve cover.

The S38 s the “clean” version of the M88 motor, introduced to allow E28 M5s sold in the United States, Canada and Japan to comply with stricter emissions regulations mandated by those governments. It utilizes a duplex (double-row) timing chain, 248-degree camshafts, a simplified exhaust manifold and features a lower 9.8:1 compression designed to work with catalytic converters. This reduced the horsepower to 256 hp (SAE) or 260 hp (DIN) at 6,500 rpm and torque to 243 lb/ft at 4,500 rpm. The S38 can be identified by the words "BMW M Power" on its valve cover.
What kind of gearbox does the E28 M5 have?
All E28 M5s have the Getrag 280/5 five-speed manual gearbox. Gear ratios are as follows: 3.51 (1), 2.08 (2), 1.35 (3), 1.00 (4), .81 (5). A 3.73:1 final drive is fitted to the non-catalyst (M88) versions, while a shorter 3.91:1 rear end is used on those with the S38 powerplant. All have limited slip differentials with a maximum locking of 25 percent.
Chassis
How is the suspension of the E28 M5 different from that of a standard 5 Series?
All M5s utilize the MacPherson strut/semi-trailing arm chassis design common to all E28 5 Series, though the suspension geometry has been altered and many components have been upgraded by BMW Motorsport in various ways, depending on the market and production date.

Up front, European-spec models produced before approximately late September/early October of 1986 feature unique Bilstein shock inserts (shared only with the European-spec M635CSi) mounted to standard E28 struts, plus a 21mm anti-roll bar. However, beginning in late September/early October of 1986, the front shocks were updated to a different iteration from Boge (also specific to the M5) and the anti-roll bar was enlarged to 25mm. In the rear, European-spec M5 built before April of 1986 retained standard E28 components, including the springs, shocks (Bilstein) and a 14mm anti-roll bar. However, the M5 received unique rear springs beginning with April 1986 production, followed roughly six months later by a switch to Boge rear shocks and a larger 18mm rear anti-roll bar.

The chassis of the North American-spec E28 M5 is different from the European-spec version in a number of ways. Its front suspension contains standard springs (shared with the North American-spec E28 535i/535is and European-spec E28 M535i/E24 635CSi) and shocks (shared with the North American-spec E24 635CSi), though it did receive the 25mm anti-roll bar used on later European-spec M5s. The M5-specific rear springs and 18mm rear anti-roll bar are identical to those of later European-spec M5s. However, the North American model is further equipped with an automatic load-leveling system that is unique to this version within the entire E28 range.
What size brakes does the E28 M5 have?
The E28 M5 has enlarged vented front rotors that measure 11.8-inches (300mm) in diameter. These utilize four-piston calipers. The solid rear rotors are the same as those fitted to an E28 535i or M535i, measuring 11.2-inches (284mm) in diameter. ABS is standard.
What wheels and tires were offered on the E28 M5?
Two different factory alloy wheels were available for the E28 M5. The majority of DC91 examples were equipped with metric-sized forged alloy wheels shared with the M635CSi and also used on some other 6 Series and 7 Series models. These measure 195mm x 390mm and are shod with 220/55VR390 tires.

Later in production, the E28 M5 was also offered with 7.5x16-inch cross-spoke alloy wheels carrying 225/50VR16 tires, usually Pirelli P700s. These wheels were standard on right-hand drive E28 M5s from the start of production in early 1986, then added to the option list of left-hand drive models starting in September of 1986 (i.e the start of the 1987 model year). In addition, all North American-spec E28 M5s, as well as those produced for Japan and South Africa, received these same 16-inch alloy wheels as standard equipment.
Cosmetics
What distinguishes the exterior of a European-spec E28 M5 from that of a normal 5 Series?
Because the intention of BMW Motorsport was to hide the performance capabilities of the M5 within a standard-looking 5 Series body, there are few external items that differentiate the European-spec E28 M5 from any other E28 sedan. The only body panel that is unique is the black plastic front airdam, included to reduce front end lift at high speeds. There is also an M5-specific aerodynamic engine compartment undertray, body-color rear-view mirror housings and a pair of "M5" badges, one on the grille and another on the trunk-lid, though these could be omitted upon request (which was common).

Two different alloy wheels were offered on the E28 M5: A metric-sized version made of forged alloy (exclusive to the M5 within the E28 series but also offered on the E24 6 Series and E23 7 Series), as well as a unique 7.5x16-inch cross-spoke wheel (introduced for the 1987 model year) that also included body-color fender lip extensions. Shadowline (dechromed) exterior trim for the window surrounds, bumpers and side moldings was optional beginning with 4/86 production.

In most European markets, the M-Technic aerodynamic package (as fitted as standard to the E28 M535i) was offered as an option. This consisted of body-color extensions with ribbed trim (front bumper and lower airdam, side valance panels, rear bumper and lower diffuser), the M-technic rear spoiler and dechromed side moldings. This option could be ordered with or without Shadowline trim and was commonly (but not always) paired with the16-inch cross-spoke alloy wheels and body-color fender lip extensions.
How is the interior of an E28 M5 different from that of a regular 5 Series?
Though identical in basic design and layout to that of any E28 5 Series, the interior of the E28 M5 is fitted with a few special items. All examples have a three-spoke M-Technic steering wheel also used in other BMW models. Most are also equipped with sport front seats, though a few were fitted with the standard "comfort" versions by request and some even had genuine Recaro front seats in place of the BMW items. In some markets, both the front and rear seats include an M tri-color stripe attached to a metal tag. On the earliest cars, the leather shift knob is topped with only an "M" logo. This was soon changed to a version with both the standard shift pattern and the tri-color M stripe. The instrument cluster contains a unique 280 kph/170 mph speedometer and a special tachometer with the M logo instead of an economy meter. A black headliner is exclusive to the M5 within the E28 range and later examples also have special door sill plates with the "M5" logo. Finally, the trunk of the E28 M5 is unique for four reasons. First, it contains the battery in a special right-side compartment, secured by one of two different covers, depending on the production date. Second, it is lined with a plush carpet. Third, with the exception of the earliest examples, the lining on the inside of the trunk lid is black instead of the usual light grey. Finally, there is a special cargo net to secure loose objectrs, though this also does not appear to have been fitted to the earliest cars.
What features were optional on the European-spec E28 M5?
Because the E28 M5 was assembled largely by hand at the BMW Motorsport facility, European customers could not only choose from the entire range of normal E28 options but also request more specialized features like hand-stitched complete leather interiors and/or integrated electronics such as phones, faxes, and minibars. Thus, depending on the market and production date, the E28 M5 could be very sparsely equipped or extremely luxurious. However, every E28 M5 features power front windows, power mirrors, central locking, and the Check Control vehicle function monitoring system. Options varied from market to market but generally included metallic paint, Shadowline (dechromed) exterior trim, headlight washer/wipers, leather upholstery (in various grades), air conditioning, the on-board computer II, power front seats, heated front seats, power sunroof, rear window sunshade, rear headrests and various audio systems.
How is a North American-spec E28 M5 cosmetically different from a Euro-spec E28 M5?
The North American-spec E28 M5 uses the same government-mandated sealed-beam headlights (all four of the same diameter) and 5-mph bumpers with integrated side marker lights as all U.S. and Canadian versions of the E28 5 Series. However, the M5 adds a special front airdam designed specifically for the North American front bumper as well as the M-Technic rear spoiler fitted as an option to some European-spec examples. Though these items are not unique to this model (both are also found on the E28 535is), the M5 can further be identified by its Shadowline trim, "M5" grille and trunk-lid badges plus the 16-inch cross-spoke alloy wheels.
How is the interior of the North American E28 M5 different from that of the European version?
Unlike the wide variation of color, trim and equipment found in European-spec E28 M5s, all North Americans-spec interiors have Black or Natur leather sport seats, with additonal hide on the seats, center console, glovebox door and door pulls. In addition, all have the M tri-color seat stripes (front and rear) and "M5" door sill plates, while the carpeted trunk always features the black lid lining, cargo net, later-style battery box enclosure and left-side storage compartment. Standard equipment includes air conditioning, power seats, power sunroof, cruise control and an eight-speaker am/fm cassette stereo system. Heated front seats were the only factory option (standard in Canada).
What distinguishes the Japanese-market E28 M5 from those sold in other markets?
BMW Motorsport produced 30 identical E28 M5s for the Japanese market during January, February and March of 1987. Though they share the same mechanical configuration as the catalyst-equipped E28 M5s sold in the USA and Canada, and are therefore included as part of the same DC93 VIN series, their appearance is far more similar to that of European-spec E28 M5s. In fact, the only notable visual difference is that the Japanese-market M5s were equipped with four identically-sized headlights instead of the smaller inboard high beams. Each Japanese-market E28 M5 was painted Diamond Black metallic (181) and equipped with Anthracite Highland cloth upholstery (0186) with the tri-color M stripes on the upper backrests. Standard equipment included the M-Technic aero package, Shadowline (dechromed) exterior trim, power glass moonroof, 16-inch cross-spoke alloy wheels, air conditioning, power front seats, cruise control, on-board computer, rear sunshade, door sill plates with the "M5" insignia, and velour floor mats.
What distinguishes the South African-market E28 M5 from the German-built versions?
The 96 right-hand drive E28 M5s produced for the South African market were assembled at the Rosslyn, South Africa factory using German-supplied Complete Knock Down (CKD) kits. The mechancal items are thus identical to those of the European-spec E28 M5.

Cosmeticaly, however, the South African E28 M5 is somewhat unique. All are equipped with the M-Technic body panels that could be ordered as an option in some European markets, as well as Shadowline trim and the 7.5x16-inch cross spoke alloy wheels. However the South African E28 M5s do not include the body-color fender lip extensions found on the German-built cars, nor were they offered with headlight washer/wipers. Also, because the South African E28 M5s were painted in the local paint shop, exterior colors were limited to five choices: Henna Red, Ice White, Cirrus Blue metallic, Delphin Gray metallic and Diamond Black metallic.

On the inside, all South African-built E28 M5s are fitted with just about every available 5 Series luxury item as standard equipment, the only extra-cost option being a power sunroof. Unique to the South African version is a complete “Highline” Nappa leather interior normally offered only in E24 6 Series and E23 7 Series models. Available in four color choices (Lotus White, Natur, Midsilver and Indigo), the interior includes Nappa leather on the seats, door panels, center console, glovebox door, headliner, sun visors, upper door trim and dashboard. (NOTE: The passenger-side dashboard does not include the storage tray found on all German-built E28s.) The M tri-color insignias remain present on the front and rear seats, though the "M5" sill plates used on all four doors of later Garching-built M5s is only found on the front doors of DC98 models. Finally, South African-spec models are not equipped with the M5-specific black inner trunk lid liner used on all but the earliest German-built E28 M5s, though they do utilize the unique black trunk carpeting.
Special Versions
NO OFFICIAL SPECIAL VERSIONS OF THE E28 M5 WERE PRODUCED.
Color and Upholstery Selections


The following chart lists all regularly available paint colors for the E28 M5.

PAINT NAME PAINT CODE MODEL AVAILABILITYPRODUCTION PERIOD
Arctic Blue metallic 045 DC91, DC9210/1984 through 08/1986
Polaris metallic 060 DC91, DC9210/1984 through 08/1986
Black 086 DC91, DC92, DC93* (*USA & Canada only)10/1984 through 11/1987
Cinnabar Red 138 DC91, DC9210/1984 through 11/1987
Bronzit metallic 139 DC91, DC9210/1984 through 11/1987
Alpine White 146 DC91, DC9210/1984 through 11/1987
Lapis Blue 173 DC91, DC9210/1984 through 11/1987
Agate Green metallic 177 DC91, DC9210/1984 through 08/1986
Diamond Black metallic 181 DC91, DC92, DC93* (*Japan only), DC9810/1984 through 11/1988
Delphin metallic 184 DC91, DC92, DC9810/1984 through 11/1988
Cosmos Blue metallic 185 DC91, DC9210/1984 through 08/1986
Cirrus Blue metallic 189 DC91, DC92, DC9809/1986 through 11/1988
Sable Brown metallic 196 DC91, DC9210/1984 through 11/1987
Royal Blue metallic 198 DC91, DC9209/1986 through 11/1987
Burgundy Red metallic 199 DC91, DC9210/1984 through 11/1987
Salmon Silver metallic 203 DC91, DC9210/1984 through 11/1987
Malachite Green metallic 205 DC91, DC9209/1986 through 11/1987
Ice White 346 DC9806/1987 through 11/1988
Henna Red 413 DC9806/1987 through 11/1988


The following chart lists all regularly available upholsteries for the E28 M5.

NOTE: For DC93 models, Natur extended leather (0237) was offered in both the U.S. and Canada, while Black extended leather (0232) was officially offered only in Canada. However, 30 U.S.-spec E28 M5s with Black extended leather were produced in 11/87. For DC91 and DC92 models, both the 0232 and 0237 interiors included complete leather coverage.


UPHOLSTERY NAME CODE MODEL AVAILABILITYPRODUCTION PERIOD
Anthracite Highland cloth 0186 / 0257 DC91, DC92, DC93* (*Japan only)10/1984 through 11/1987
Pacific Blue Highland cloh 0187 DC91, DC9210/1984 through 11/1987
Nutria Highland cloth 0188 DC91, DC9210/1984 through 11/1987
Pearl Beige Highland cloth 0189 DC91, DC9210/1984 through 11/1987
Pine Green Highland cloth 0190 DC91, DC9210/1984 through 11/1987
Black leather 0203 DC91, DC9210/1984 through 11/1987
Black extended / complete leather 0232 DC91, DC92, DC93 (see note above)06/1986 through 11/1987
Pacific Blue leather 0204 DC91, DC9210/1984 through 11/1987
Pearl Beige leather 0206 / 0287 DC91, DC9210/1984 through 11/1987
Natur extended / complete leather 0237 DC91, DC92, DC93 (see note above)06/1986 through 11/1987
Cardinal Red leather 0256 / 0289 DC91, DC9210/1984 through 11/1987
Cardinal Red complete leather 0239 DC91, DC9209/1986 through 11/1987
Silver complete leather 0233 DC91, DC9206/1986 through 11/1987
Anthracite leather 0284 DC91, DC9209/1987 through 11/1987
Anthracite Buffalo leather 0180 DC91, DC9210/1984 through 11/1987
Lotus White complete Highline leather DC9806/1987 through 11/1988
Natur complete Highline leather DC9806/1987 through 11/1988
Midsilver complete HIghline leather DC9806/1987 through 11/1988
Indigo complete Highline leather DC9806/1987 through 11/1988


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