This replacement Billet Oil Cap is beautifully over-engineered in customary Racing Line fashion to give an exquisite feel and appearance every time you top up your oil. The internally-sprung mechanism in the cap provides an effortless, yet incredibly satisfying “click” when screwed into place. Make topping your oil up a pleasure. Racing Line’s Oil Cap is all about the 'click'. Never again will you worry whether you tightened your oil cap fully - as the internally sprung cap clicks hard and locks into place. Not only does this internal springing mechanism provides the lovely click – more importantly it ensures absolute tightness when fitted, even with the heat soak from a high performance engine. Meaning that this cap will ensure that you'll never again have the problem of 'weeping' oil leaks from the standard cap - a known issue with the EA888.3 engines. As you’d expect from Racing Line, it’s meticulously machined with the latest CNC 5-axis technology. Each cap starts life as a solid billet of 6061 aerospace-grade aluminum. It’s then hand-polished, then gloss-anodized Midnight Black to stay beautiful year after year.