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Why Is My Differential Fluid Dark Brown or Black after only 1 year? 200 1988

posted by  Michael Yount on  Sun Oct 13 14:13 CST 2019
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last visit: Thu Oct 23 20:03 CST 2014
[RELATED]

Color is a terrible indicator of lubricant health. Ask the folks at Blackstone Labs who do oil analysis. Ask the big rig owners who often go 15k-30k miles between changes based on periodic oil analysis. And their oil is “black” for all but the first few hundred miles after the change.

For the third time - no noises? Performing ok? No leaks? You’ve got a healthy diff with new fluid. DRIVE THE CAR.

If you still can’t let it go - buy some regular ol’ dino rear diff fluid. Change it again. Drive around for a week or two and then do a “hot change”. Then put another round of new synth in it. You’ll have the cleanest rear end in town. And who doesn’t want a clean rearend?
--
82 242-6.2L; '17 Mazda3; '16 Crosstrek






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