Factory character
The factory details buyers are actually trying to keep intact
Factory Equipment
E28 M5 factory equipment guide
The E28 M5 has a short option story compared with newer M cars. Market version, original M hardware, upholstery, and period-correct details carry more weight than a long convenience-equipment list.
Engine focus
The motor that defines the whole equipment story
Drivetrain and chassis
S38 inline-six
North American cars use the catalyst-equipped S38B35, paired only with a five-speed manual transmission.
M-specific suspension
Springs, dampers, anti-roll bars, brakes, and steering calibration are central to how a correct car should feel.
Limited-slip differential
The factory differential is part of the original supersedan package and should be verified during inspection.
Cabin and exterior identity
Natur or Black leather
The two North American upholstery choices create the clearest factory-spec distinction among otherwise all-Black cars.
M5 body details
Correct spoilers, badging, trim, and period wheels matter because ordinary E28 pieces can make an incomplete car look superficially convincing.
Original documentation
Window sticker, books, tools, service records, and evidence of factory specification add confidence in a market where restored cars vary widely.