Something causes vanagon heads to corrode, causing pits and the resulting leaks which make otherwise decent vans dirt cheap. The cause could be anything, but spending a couple dollars extra for coolant which matches VW specs is cheap insurance for me.

This topic comes up again and again and I haven't read a definative reason heads leak. Until I do, I'll follow the directions the manual gives me. Why not?

john

> My Dad operated an 83 Cadillac with an aluminum block engine and heads for
> 18 years without damage from using standard old glycol based antifreeze.