15W-40 Chevron Delo 400 since 1998 in:
1992 BMW 325i 123,000 mi
1994 Ford F-150 5.0l 125,000 mi
15W-40 Shell Rotella T is currently in:
1972 Buick 350ci 65,000mi
1987 Dodge Van 5.2l 80,000mi
Pennzoil Longlife previously used since the 1980's in:
1968 VW new engine
1957 Chevrolet 283ci mileage unknown
Except for the Ford, these cars never see temperatures below +40F in coastal Southern California. The Ford is operated in the mountains and desert with temperature extremes of about +10F to +100F. The same oil is used all year.
The Buick, Chevrolet and VW are collector cars in runnable storage. The others are on an annual oil change schedule, as annual mileage is relatively low. I like the more robust base oils and additive packages of HDMO, especially the high TBN for stored or infrequently driven ones due to the extra corrosion protection.
[ March 02, 2004, 12:03 PM: Message edited by: Jimbo ]