BTK S58/B58 Billet Oil CapBuilt to Kill USA's new billet oil cap! Precision machined billet oil cap designed for BMW B58 and S58 engines. CNC cut from high quality 6061 aluminum for a perfect OEM style fit with a clean, motorsport inspired look that elevates any engine bay. Made in the USA, this cap offers durable construction, crisp machining, and a secure sealbuilt to handle daily driving and track abuse alike. A simple upgrade that delivers premium feel and long term
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