C.A.F.E.quote:
Originally posted by buster:
My friend who recently bought a new C5 said it says in the manual not to use a 40wt. oil yet the same car in Australia can use it. We all no why we use 30wts. in NA, but why would his manual tell him not to use it? Damage?
Originally posted by JohnBrowning:
[QB] Conventional 10W40 are full of viscosity improvers and have been banned by most all manufactures.
If a company like Mercedes approves the use of 10W40 and use it as first oil fill in their engines i assume that there is no problem with this viscosity any more web page
There are no conventional oils that meet the GM4718M spec for Vettes.quote:
Originally posted by Dr. T:
GM has an oil spec for vettes...isn't it 4718 or something. Do any conventinal oils meet this? Anyone know more about it??
I think it would be impossible for a conventional oil to meet this spec, not because of technical reasons, but simply because in order to qualify for that spec it must be labelled as a fully synthetic oil. I believe it also needs to be 5w30 too.quote:
Originally posted by G-Man II:
There are no conventional oils that meet the GM4718M spec for Vettes.quote:
Originally posted by Dr. T:
GM has an oil spec for vettes...isn't it 4718 or something. Do any conventinal oils meet this? Anyone know more about it??