PCMO stands for passenger car motor oil. BTW, I misspoke there as well. Most PCMO's are multiviscosity oils. HD's are usualy meant for constant temperature, constant load engines.
Yeah, I thought you were speaking of motor oils that had the engine manufacturers names on them.
I still think 30 weight HD would be better than the Pennzoil straight 30 since HD motor oils are slightly thicker, have more dispersants and detergents, and slightly higher levels of anti-wear additives.
[ August 10, 2003, 01:18 AM: Message edited by: MolaKule ]