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Posted by David Sherman [72.47.9.228] on Monday, February 14, 2011 at 20:54:40 :
In Reply to: WHAT GEAR OIL IS BEST FOR DIFFERENTIAL? posted by junior [64.136.27.227] on Monday, February 14, 2011 at 19:32:39 :
I have been using 85w/140 conventional gear oil in all my gearboxes for years now. I got half a dozen buckets from army surplus at one point, and then a full 55 gallon barrel at a yard sale. Honestly, it's too thick. I'm sure it does a fine job of lubricating, but starting out on a cold morning I can definitely tell I've got some heavy oil in there. I have so much I'm using it in my chainsaw too. I would go with 80w/90 if I was buying new. But since you already have the 140, the only harm in using it is a little bit worse fuel economy.