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Terry, NJ · 05-13-2010, 10:03 AM

Chris, I think you're right about running 100% STP in the rear. I don't know why, but I wouldn't do it either. We had this discussion about Rear end/ transmission oils over in "Yesterday's Tractors" Ford N section. It seems that the ford N series tractors have to have GL1 oil, If not, the bronze bushings will corrode due to sulphur content. GL1 is hard to find. Like 600, you can't get it in the average AP store. GL 4 and 5 are much more common. Is there any bad effects from running say 75/140 or a comparable modern "mix"? I for the life of me, can't see any.
Regards, Terry

05-13-2010, 10:03 AM	#19
Terry, NJ Senior Member Join Date: May 2010 Location: Bucks Co, Pa Posts: 3,740	Re: Differential oil used Chris, I think you're right about running 100% STP in the rear. I don't know why, but I wouldn't do it either. We had this discussion about Rear end/ transmission oils over in "Yesterday's Tractors" Ford N section. It seems that the ford N series tractors have to have GL1 oil, If not, the bronze bushings will corrode due to sulphur content. GL1 is hard to find. Like 600, you can't get it in the average AP store. GL 4 and 5 are much more common. Is there any bad effects from running say 75/140 or a comparable modern "mix"? I for the life of me, can't see any. Regards, Terry