Steering Pump Reservoir Cap | Fits BMW E90 E46 M3 | N54 N55 M54

This power steering reservoir cap replaces the original on many BMW models, like the E90, E46, and E60. It's machined from a solid piece of 6061-T6 billet aluminum. It seals much better than the plastic fluid cap and helps stop leaks. Features and Benefits - Billet Aluminum Build - It resists cracking and warping. Factory plastic caps often do this, especially when the engine gets hot. - Anodized Finish - This coating protects the aluminum from corrosion. Power steering fluid and engine bay conditions can cause this. - Better O-Ring Seal - It includes a new, strong o-ring. This creates a tight, leak-proof seal on the power steering reservoir. - Knurled Grip - The textured outer edge makes it easy to tighten or remove the cap by hand. You can do this even with greasy fingers. Applications - Fixing a Leaking Cap - This fixes a common cause of power steering fluid leaks. These leaks come from a cracked or worn original cap. - Engine Bay Update - It replaces the plain factory cap with a clean, machined part. This makes your engine compartment look better. - Preventative Care - This is a good upgrade for any high-mileage BMW. It helps stop future cap failure, especially if you're working on the power steering pump.