Duke,

All records for the car are kept. It's company car and our mechanics keep very good records.

Oil level is checked after short use after oil change. It was filled to the proper level.

The Mobil 1 was 10-30. Would the lighter weight make a difference?

800 mi/qt seems too high and out of the "normal" range. My father is also worried about a catastrophic failure - as in a broken ring - stranding him.

60K seems pretty early to have to do valve guides. I have not been able to document such a problem - either here or on other boards.

Any other suggestions?

Jeb