Hi guys....just recently joined and have just got a 53plate Vectra SRI DTI 2.2 with a 140k on the clock. Drives very well and I love it already!

Just asking for some advice on engine oil as I'm going to drop it this weekend. What's the best oil to use? Semi or full synthetic?
Also is there a 'how to do' guide on here somewhere?

Cheers, Adam