Originally Posted by
big john
I've heard this debated since I was a ute. I've seen a document from GM saying it's better to not change the oil because the metal in the oil acts as a lubricant. Same with differentials.
Some manual transmissions use ATF instead of gear oil. If I was going to change the oil on a manual trans, (I never have) it would be one with ATF.
I always heard that argument with higher mileage automatics. That the extra material in the oil provided friction. But What would that do to the bushings and bearings?