S38B35
"Just couldn't afford to keep it running. About a million things."
Head and Valve Train DamageCRITICAL
Forum data references cylinder head scoring from piston debris, with noted damage to valve springs, retainers and cylinder walls. On a 35-40 year old engine, deferred maintenance accelerates this dramatically. Complete head rebuilds are expensive and specialist parts are scarce.
Cam Gear and Timing Chain WearHIGH
The S38B35 cam gears are a known wear and tuning point discussed in the enthusiast community. On ageing examples the timing chain, tensioners and cam gear hardware require inspection and often replacement. Failure to address leads to timing slip and potential engine damage.
Valve Cover and Gasket Oil LeaksMODERATE
The S38B35 valve cover, including the oil fill cap area over the timing chain, is a common source of oil leaks on aged examples. Valve cover gaskets harden and crack over decades. Forum activity around sourcing used valve covers confirms this is a recurring concern.
Parts Availability and Escalating Ownership CostsMODERATE
The S38B35 was produced in very limited numbers for North America only in 1987-1988. Forum evidence shows owners actively parting out engines and hunting used components such as valve covers and cam gears. New OEM parts are largely unavailable and specialist sourcing is required for most repairs.
General Age-Related Cooling and Rubber Component DeteriorationLOW
All examples are now 35-38 years old. Rubber hoses, coolant system components, engine mounts, seals and wiring insulation will be at or beyond service life regardless of mileage. Preventive replacement is mandatory on any purchase.
The S38B35 is a genuinely rare and historically significant engine produced for North America for just two model years, which means every surviving example is a collector piece carrying serious financial and mechanical risk. Forum evidence is unambiguous: ownership costs are high, parts are scarce, and even enthusiasts with E28 M5 experience acknowledge these cars are expensive to keep running. Only buy an example with complete service documentation, a clean compression test and evidence of recent timing chain and cooling system work. Budget a minimum of €3,000-5,000 in preventive maintenance immediately after purchase regardless of how good the car appears, and ensure you have access to a specialist BMW mechanic with specific S38 experience before you need one in an emergency.