I have heard great things about the non-water based coolants. I hear they last forever.

I am the same way with oil but within reason. It would be great to use an oil that never breaks down but if the oil is contaminated long before it breaks down, then that isn't a concern.

I run a full synthetic on my Geos but also figure they will need to be changed long before the spec on the oil because the engines are more worn.

I might just do an oil analysis one of these days but have more or less settled on 5,000 mile changes as of now.

Conor