Originally Posted By: demarpaint
I had a few cases of it in 10W40 back in the mid 1970's IIRC. It came in the round cardboard quart cans, with the metal tops. It was an OK oil as far as I can remember. For the right price (dirt cheap, next to nothing) I'd use it in a beater I guess.
AFAIK, in the 1970's, STP ONLY came in a 10W-50 grade, and was a '15,000 mile' extended-drain oil.
Don't know if it actually lasted that long, but that was it's big selling point in the ads of that period.