I'm going with castrol gtx next, after good feedback from bobs oil website forums on a good dino oil.
What weight should i get? I was going to go for 10w40 after getting bad economy on 5w-30 (why, i never found out)
but recently read that 15w-40 would be better, as the oil is less stretched between 15 and 40, opposed to 10 to 40 that has to work harder to hit each grade
What say you, 15w or 10w? bearing in mind the recommended is 10w-40 for my car
Also, castrol high milage is supposed to be 'thicker' whatever that means in real terms. now i've hit 100k should i look to this?
ta