Mostly Mechanical

Auto & Truck Oils, Lubes & Filters – Separating Technology from Hype

Differential Fluids, Differential Covers, and Towing.

OK, what’s the real scoop on differentials?  What do aftermarket differential covers do for you?  Should you buy one or make it yourself?  When should you worry about it?  When do you need a temperature gauge for your differential?  Those questions and more came up in a recent online user forum, and the experts’ answers were excellent.  If you do any towing, I believe this information is critical for you.

OEM’s agree that to maximize your differential life you need to do your first fluid change at 5,000 miles, and lubrication and drivetrain engineers will add that a high-performance synthetic is the best and longest-lasting choice.  Maybe you’ve heard that, but what synthetic should you choose?  Remarkably, there are downright embarrassing differences in the tested performance of gear lubes on the market.   In fact, using the wrong one in a towing application will probably take your differential into early failure.   You can download a free research study detailing the performance testing of 14 name-brand gear lubes.  Think it doesn’t matter much?  On the contrary, we found it very disturbing that over half of the name-brand gear lubes failed one or more of the standard performance tests.

That study is also excellent because at the beginning, as background, it outlines the results of operating-temperature studies done on differentials in towing applications.  The information from those studies is eye-opening.  So enjoy.  And remember, your entire vehicle and towing load rests on TWO GEAR TEETH in your differential: your gear lube choice is critical !

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February 25, 2008 Posted by | Amsoil, Diesel, Diesels, Fleet, Lubrication Oils & Fluids, Vehicle Maintenance | , , , , , , | 2 Comments