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Replace the factory oil fill cap with the Wehrli Custom Fab WCF100395 Billet Black Anodized Oil Fill Cap from Mullet Diesel Performance. This cap is designed to be a direct-fit replacement and includes an O-ring gasket for a tight, leak-free seal. WCFAB proudly manufactures this cap right here in the USA. This oil fill cap is constructed from a high-quality billet aluminum construction and features a machined cam lockout.