been to motor factors today and picked up service bits for the rs, now i asked for a decent 15w 40 oil, the bloke said " thats no good for that you need 20w 50 for it, used it all the time when i was on the spanners servicing rs turbo's" so im confused.com now, what do i need?
spec is basicly standard engine thats been rebuilt about 10000 miles ago with a chip and front mount

cheers, neil