Racing Line's Billet Oil Cap for the Audi V6 3.0T and 2.9TT engines found in the B8 and B9 S4/S5/SQ5 and RS4/RS5 is beautifully over-engineered in customary Racing Line fashion to give an exquisite feel and exceptional product experience every time you top up your oil. Fitting the Racing Line Audi V6 Billet Oil Cap means that never again will you worry whether you fully tightened your oil cap. Even with the heat soak from a high performance engine, the precision engineering ensures absolute tightness when fitted as this billet aluminium cap clicks hard and locks into place. 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 all TFSI engines. This Billet Oil Cap is applicable to the Audi V6 3.0T and 2.9TT EA839 engines found in B8 and B9-platform S4/S5/SQ5 and RS4/RS5. Any vehicles with 2.9TT and 3.0T TSI EA839 V6 engines. Additionally, this cap fits 4.2 V8 engines, plus Audi R8 5.0 V10. And as always from Racing Line, this beautiful over-engineering gives an exquisite feel and exceptional product experience. Lastly, a new rubber seal is included with these new oil caps - meaning they are ready to fit.