Recent purchase of a 2006 xk 4.2 litre l would like suggestions on engine oils and transmission oils , l have been informed to stay away from castrol as it destroys rear main seals , also being from east coast of qld 5w30 or 5w40 engine oil ?

 

Welcome to the forum, when time permits place an introduction in the New Members section where you’ll receive a warm welcome internationally.
You could also ask in the Queensland section where you may find someone locally.
Good Luck.