Hi and hello,
I am obviously a newbie so please be gentle
I have the 1.7 CDTi Astra 100bhp model, I am a little confused as to the engine oil grades at Costco.
I have read that I need 5w 30 fully synthetic, at costco they sell 5w 30 oil but it doesn't say for diesel, they also do a 10w 40 which says diesel, I know this may seem obvious but, I have also read 5w 30 fully synthetic will work in both petrol and diesel
I also noticed they do a castrol magnatec 5w 40 I think that doesn't actually say on the bottle type on engine that it is designed for.
Many thanks for your help in advance guys