What is the difference between 80w90 gear oil and 85w90 gear oil?
I know that the 85w90 was the standard gear lube for umpteen years. I am asking because 85w90 oil is $3 a quart and 80w90 is between $7 and $10 a quart. Synthetic 75w90 is between $12 and $15+ a quart.
Is the 80w90 a semi synthetic?
Is there anything wrong with running 85w90 if the manual calls for 80w90? I am guessing that I might get a slight drop in fuel economy when the lube is cold, but that is all. The ability to lubricate the gears should still be the same.
I know that the 85w90 was the standard gear lube for umpteen years. I am asking because 85w90 oil is $3 a quart and 80w90 is between $7 and $10 a quart. Synthetic 75w90 is between $12 and $15+ a quart.
Is the 80w90 a semi synthetic?
Is there anything wrong with running 85w90 if the manual calls for 80w90? I am guessing that I might get a slight drop in fuel economy when the lube is cold, but that is all. The ability to lubricate the gears should still be the same.