There is a slight viscosity difference between the Dexron III and the newer Dexron VI; the newer stuff being slightly thinner. I saw Dexron III Pennzoil at Pepboys. Also, Valvoline makes the "Max Life" oils and ATF. It's supposedly formulated for older cars, with a bit more seal conditioners, detergents, and slightly higher viscosity. I like the concept; so I run the 10-40 oil and the ATF.

DG