Has anyone had air bubbles in there gear box oil I'm running 15w40 semi synthetic. Some one said its just what happens when you put engine oil in in the lt85 but part of me feels that I could be over heating parts of the gear box having the air bubbles in the oil. Should I just put 20w50 mineral oil this is what Ashcroft recommends. Gear box feels good with 15/40
Cheers
Jesse