Forget the thin as water crap and run 10W50 fully/Semi synthetic. I have used this up until 200,000km and as it now sounds a bit coarse
I have switched to 15W40 semi synthetic for the last 20,000km. This ups the compression and gives a smoother quieter drive.
Unless you intend to thrash the nipples off it every weekend at the race track, fully synthetics are overkill.
A semi synthetic changed every 10,000km's(Don't forget to change your filter as well) a flush is also good, you will never sludge or damage your car and it should go beyond 400,000 kms.
Cheers Down under Australia James Dixon
Out of those, the best ones are the Fuchs/Silkolene Pro S, Millers CFS/CFS NT, Motul 300V, Redline and Gulf Competition. The Motul 8100 X-Cess, Millers XFS, Fuchs GT1 XTL/Supersyn, Gulf Formula G, Shell Helix and Mobil Super 3000 are good, cheaper alternatives.