MMR Performance | Baffled oil sump | BMW N55

At PERON Automotive, we’ve seen first-hand just how vulnerable the N55 engine (found in the BMW M135i, M235i, 335i, and 435i) can be to oil starvation under high-performance driving. Whether you’re hitting the track or enjoying some spirited road use, this upgrade is not optional—it’s essential.

The N55’s factory oil control system simply isn’t designed for sustained lateral G-forces or aggressive driving, which can cause oil to surge away from the pickup under hard cornering, braking, and acceleration. The result? Oil starvation, rapid wear, and in many cases, complete engine failure.

Ask us how we know — we’ve experienced it ourselves, and that’s exactly why we trust this upgrade on our own builds.

Why Install the MMR Oil Control Baffle?

• Prevents oil surge under hard cornering and braking

• Designed specifically for N55 engines

• Vital for track day reliability and engine longevity

• Precision-engineered for perfect fitment and durability

Don’t wait for disaster to strike—this is one of the most important upgrades you can make to your N55-powered BMW if performance driving is in your plans.