BMW 8 E31 Parts

The E31 BMW 8 Series occupies a singular place in Bimmer lore - a car that was too expensive, too complex, and too ambitious for its time, and somehow perfect because of all three. Built from 1991 to 1997, the E31 was BMW's flagship grand tourer, a low-slung V8 and V12 coupe that shared development resources with the contemporary F1 program and showed it in every detail. If you're here shopping parts for your 8 Series, you already know you're not driving something ordinary. This is a car that demanded respect when it launched and commands even more of it today.

The chassis itself is a masterwork - a wide, aerodynamically sculpted body with flush door handles, pop-up headlights, and a roofline that still looks futuristic three decades later. The E31 introduced fully electronic throttle control (the E-gas system) to production BMWs, along with active stability systems that were genuinely cutting-edge for the early 90s. It's also one of the last BMWs that feels hand-built in the best possible sense. Panel gaps are tight, materials are substantial, and the driving experience is more analog than the spec sheet suggests.

The US market E31 came in two main flavors. The 840Ci ran the M60B40 or later the M62B44 V8, while the 850i and 850CSi carried the M70B50 or the legendary M73B54 V12. Then there's the unicorn: the 850CSi with its S70B56 - a hand-assembled, high-compression 5.6L V12 developed alongside the McLaren F1 program. If you have one of those, treat it accordingly.

For most builders, the sweet spot is the 840Ci with the M62B44. The M62 is the more modern of the two V8 options, with better head flow, a more robust bottom end, and greater aftermarket support. Cold-start rattle from the Nikasil bore coating is the notorious weak point on early M60 engines - if you're buying an M60-powered car, do your bore inspection homework before committing. The M62 moved to iron-lined bores and solved that issue. Browse our engine parts and rebuild components if you're in the middle of addressing either of these motors.

The cooling system on all E31s deserves immediate attention regardless of which engine is under the hood. The plastic expansion tank, water pump impeller, thermostat housing, and radiator end tanks all age poorly and fail in ways that can do serious damage quickly. This isn't a "maybe someday" upgrade - it's the first thing you do when you take ownership. Coolant flush, full cooling system refresh, and a quality aluminum thermostat housing. Our cooling system section has everything you need to do this job right the first time.

The E-gas throttle system is another area where E31 owners spend time troubleshooting. The throttle actuator, position sensors, and the associated wiring harness connectors are all age-sensitive. Clean connections and properly functioning E-gas is the difference between a car that drives beautifully and one that surges, stumbles, or throws codes on every cold start. Sensors and electronics are worth bookmarking if you're chasing electrical gremlins.

Most E31 owners fall into one of three camps, and the mod path looks pretty different depending on which one you are.

If you're running the 840Ci as a daily driver or weekend grand tourer, the priority list is reliability and refinement. That means the full cooling overhaul, fresh bushings throughout the front suspension (the control arm bushings and thrust arm bushings wear significantly and kill front-end feel when gone), a proper transmission service on the 5-speed automatic, and fresh differential fluid. Bilstein B6 or Sachs Performance shocks are the community's go-to for a ride quality improvement that doesn't sacrifice the GT character. Suspension components for the E31 are well-stocked here.

For the weekend warrior building a more aggressive street car, the M62 responds well to individual throttle body conversions, exhaust work, and a tune. The stock intake manifold is a restriction at higher RPM, and the aftermarket has caught up enough that you have real options. A proper stainless exhaust system wakes up the V8 tone significantly - the stock system is quiet to a fault. Exhaust options for the E31 are worth a look if you've been tolerating the factory sound.

Full track or restomod builds on the E31 are a serious undertaking given the car's complexity and weight, but they're happening more frequently as values rise and enthusiast investment follows. The S62 swap from an E39 M5 is the conversion the serious build crowd gravitates toward - same basic architecture, significantly more output, and a powertrain that's well-understood. Subframe reinforcement, upgraded brakes, and coilover fitment round out a build that turns the grand tourer into something genuinely fast. Brake upgrades and wheel and tire fitment are natural starting points for that direction.

The E31 rewards patient, knowledgeable ownership. Parts availability has improved meaningfully as the collector market has grown, and the community knowledge base is deep. You're driving a piece of BMW history - keep it sorted and it'll remind you why BMW built it in the first place.