I think I read here about some grades of motor oils being not up to par back in the 1980’s?
Anyone remember this?
Thank You
Anyone remember this?
Thank You
Blackstone cannot test for most of the attributes that would define the problems of oils back then.Black stone did a UOA running a decades old oil.
Yeah. I do remember.I think I read here about some grades of motor oils being not up to par back in the 1980’s?
Anyone remember this?
Thank You
I wondered why my dad told me don't ever use Penzoil. I always wondered why, but to this day I won't. I actually useds PUP once - i figured its Shell now so must be OK. Still felt guilty the whole time, changed it out early.The only thing I remember from back then (high school mid 70's) was not to use Pennzoil because it had wax in it.
In 1976 GM recommended 7,500 miles oil change intervals, oil filter every other oil change.