> And as food for thought, in a long-term experiment, my 1984 Mitsubishi
> truck which was run exclusively on synthetic oils and changed at 3K
> intervals has 140 PSI compression at 160,000 miles, the spec for a brand
> new engine (and no, it is not due to carbon in the combustion chamber!).
> 
Another example of this: My Dad's 89 Jetta GTX has run on synthetic 
since new, and at 245k km, still tests at 190psi on all 4, which is 
also within spec for a new engine. 

Shawn Wright (VWnut@smus.bc.ca)
'88 Westy (336k)
'85 Jetta TD (358k)
'69 Wife
'97 1st child (! :)