There's another potential problem with that lower viscosity - oil pressure.
If I run 20W50 in my 66 Alpine, I get much lower oil pressure (hot) than if
I run straight 30W. I usually run 30W Castrol detergent oil with much better
pressure results.
Of course, with either oil, it's going to mark it's territory a little.....
Jon Arzt
------ original message -------
>The synt. oil has a MUCH lower viscosity all the time therefore will burn
>past the rings and valve guides faster in old engines and leaks past
>British
>seals quicker... Don't plan on switching if you exhibit these problems it
>will make the oil spot on the cement bigger and you will have to top up
>more
>often.
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