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BMW S65
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BMW S65
Verdict
RISKY · 52/100
Est. cost /3yr
€4,500–8,000 over 3 years if rod bearings and throttle actuators have not been recently addressed at purchase; €2,500–4,000 over 3 years if preventative bearing work is already documented
Oil interval
8,000 km
Recalls
2
Worst issue
Rod Bearing Failure
CRITICALBMW S65
E90/E92 · E9x M3
Rod Bearing Failure
€1,500-9,000
Throttle Body Actuator Failure
€800-2,500
Wiring Harness Deterioration (NHTSA Recall)
€300-1,200
Takata Airbag Inflator (NHTSA Recall)
€0 (covered by recall)
BMW S65
E90/E92 · E9x M3
•Pull the oil pan or request documented proof of rod bearing replacement with upgraded BE or MAHLE bearings and new TTY bolts before purchase
•Perform an OBD-II scan for throttle actuator fault codes (both banks) and any stored electrical faults
•Check NHTSA recall completion status for both the airbag inflator and wiring harness recalls via the car's VIN
•Inspect service history for oil change intervals, reject any car serviced beyond 10,000 km intervals without documented short-interval maintenance
•Listen for lower-end rod knock during a cold start and under hard acceleration above 4,000 rpm before committing to purchase
•Verify both throttle actuators operate correctly, test for limp mode triggers and request a recent throttle actuator replacement receipt if mileage is above 80,000 km
•If considering a GTS-badged car, confirm the engine is genuinely the S65B44 4.4L via build documentation, given how few were made and how commonly the badge is faked on standard cars
BMW S65
E90/E92 · E9x M3
Rod Bearings
Preventative replacement with BE or MAHLE upgraded-clearance bearings and new rod bolts
Before or at 100,000 km, or immediately on any used purchase with unknown history
Throttle Body Actuators (x2)
Inspect both units; budget for replacement as a pair
60,000-120,000 km
Wiring Harness
Verify NHTSA recall completion and inspect harness condition
100,000 km+
BMW S65
E90/E92 · E9x M3
Air Bags – Frontal Driver Side Inflator Module
Takata inflator rupture risk; potential injury from metal fragments during airbag deployment
Electrical System – Wiring
Wiring harness defect may cause electrical faults or safety system malfunction
BMW S65
E90/E92 · E9x M3
✓Sonorous, high-revving 4.0L naturally aspirated V8, widely regarded as one of BMW's greatest engines
✓Proven longevity when maintained correctly, examples with 300,000+ km documented
✓Large and active enthusiast community with extensive DIY resources and group buys for parts
✓No turbo or charge cooling system complexity to fail
✓Upgraded bearing solutions (BE, MAHLE) are well-established and affordable relative to engine value
BMW S65
E90/E92 · E9x M3
Real consumption
15 L/100km
Official consumption
Not available
Oil interval
8,000 km
Oil spec
BMW LL-01 5W-40 fully synthetic (community strongly recommends 8,000 km or less intervals to protect rod bearings)
Est. cost /3yr
€4,500–8,000 over 3 years if rod bearings and throttle actuators have not been recently addressed at purchase; €2,500–4,000 over 3 years if preventative bearing work is already documented
BMW S65
E90/E92 · E9x M3
420 hp · 400 Nm
2007–2013
450 hp · 440 Nm
2010
The standard S65B40 is what almost every used E9x M3 buyer will encounter, and it shares the same rod bearing failure mode and inspection requirements regardless of which chassis it sits in. The S65B44 in the GTS is a genuinely different, larger displacement engine, not just a power bump, but it is so rare that most buyers will never see one for sale, and it should be verified carefully against build documentation if encountered since GTS badges are sometimes applied to standard cars. For either variant, the buying decision comes down to the same thing: documented rod bearing work, not the power figure.