Just picked up 2 quarts of Mobil 1 Synthetic Gear Lube. I have a 4oz. bottle of Pennzoil additive that's about 5 years old. Any problem using it when I change the gear lube?
Hey Bob,OLDGUY said:HI CHARLIE
I don't know for sure but I never heard of it having a shelf life . I would put it into a clear container and look for sediment in the bottom of the original container ( separation of product ). If all lookes good I would use it JMHO. I think my rear took 3.5 Qt's to fill it not 2 Qt's