Matt I've had the oil changed over the weekend, and I'm running 5-30 fully synth, but in my Astra, I always added a tin on Wynns Oil Addetive Is it also worth using it on the Vectra? http://www.wilcodirect.co.uk/index.php? ... ncuvneu5r0
sdbutler10 5-30 fully syn is good to use on ur vectra. most dervs i know of use 10-40 as of the turbo oil seal like to pass oil and 5-30 being quite thin gets through the little seals at times.
Matt VX specifically state to use 5-30, although the thicker one can be used. It does say in the owners hand book NOT to use any addatives in the oil