All good responses and much appreciated. I am religous about letting the engine idle before shutting down also I normally ease into home/work so I don't have a super hot engine when pulling in. The oil still feels fine and no sludge or build up, what with only 4k of driving.

A brand spankin new 1973 series 3 Landy
OLIVE DRAB SWB, TURBO, IN ABOUT 36 PIECES
89 TROOPER, RESCUED FROM THE YARDS. (Down again)
05 TACOMA CREW SHORTY.