BMW S65 (4.0 and 4.4)

BMW M's 4.0 V8 — the E90/E92 M3's engine, and the only V8 M3.

It is the S85 V10 with two cylinders removed, and that lineage is the most useful thing about it: individual throttle bodies, 8,400 rpm, and the same rod-bearing pattern. bmw-s85 in this catalogue carries the detail, and it applies here.

Preventive rod-bearing replacement is accepted practice, and oil analysis is how the question gets asked before an engine is stripped.

The throttle actuators are the second item and fail into a reduced-power mode with a code rather than quietly. They are rebuildable.

Oil grade, level and interval are not routine advice on an engine with these clearances and this rev range — most of what goes catastrophically wrong traces back to one of them.

⚑ The GTS and CRT are 4.4, not 4.0. The standard E90 M3 is the four-litre; the limited cars are bored out, and this catalogue carries one of them. A rod-bearing interval quoted for one is quoted for both, which is the fact most owners come for.