Originally Posted by vroomtshh

Fully synthetic oils offer very little advantages over mineral oils and semi synths, other than they last a bit longer. I used to believe all the marketing hype surrounding oils, but its like most other things. It really comes down to how often you change it.

FOr an RS turbo, anything above 10-40 will be fine. I would just get some cheap 20-50 if I was you. Asda do some own brand stuff for less than a fiver. get that and change it every three months or 3k miles. It'll be spot on.