BMW M3/S14 Engine Specifications & Exploded View
General Engine Description, The average engine life expectancy is about 140,000 to 150,000 miles.
But some owners feel the M3 lacks low to mid-range rpm “grunt”. In other words, it doesn’t pull to their liking below 4,500 rpms. M3 Engine Anatomy. A 16.5% flow increase is achieved by machining the intake ...