Ok, I have read your comments but bought the mineral oil anyway. The car seems to work fine with it so far. Nice and quiet.

The first kit I fitted was a brand new CVH 34. Last not more than 75 Swedish miles. Than I was buying a ported head with cam. Couldent see what sort of cam it was (not kent) it last 100 Swedish miles.

When I bought the car it run on mineral and thats what Im going to do again.

A question: Did syntehtic oil exist when our car was made back at the eighties? We all know that the CVH head is running very hard at the cams, thats why the belt is supposed to be changed often compared to other cars. Im willing to think that the mineral oil 20-50w is more likely to sustain the oil film between the cam and tappets and other components.

Why I have this idea is just because I have had two cam breakdowns. I know that the Kent cams is poor but Im willing to try the mineral oil for a time now.

BR Butchi