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Archive for April 19th, 2006
Synthetic 75w/140 Gear Oil
Posted by Steve on April 19, 2006
Will the Castrol SynGear 80w/140 meet the same requirements as the Synthetic 75w/140 application for the Ford F250 trucks? I see they are both GL-5 products. I would assume that the 80w/140 would be ok for top-off but for a full fluid exhange, the Ford High Friction modifier would need to be added.
The axle you mention is a limited slip differential, and is very lubricant sensitive, the 75W140 and the additional friction modifier you describe has been specially formulated to alleviate some noise issues that were seen when a conventional lubricant is used. If you use any other product this will affect the warranty of the axle, therefore I would recommend that you stick to the Ford recommendation.
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