Volvo RWD 444-544 Forum

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544 Differential oil 444-544

posted by  someone claiming to be tommyt544 on  Thu May 16 09:31 CST 2019 [RELATED]

I'm using Pennzoil Platinum GL-4 75W-90 gear/axle oil in my M40 and it loves it. Can I/should I use the same in the differential?

Thanks!








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544 Differential oil 444-544

posted by  c1800 on  Fri May 17 00:39 CST 2019
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last visit: Sun Oct 5 19:37 CST 2014
[RELATED]

No, you need GL-5 Hypoid oil for the diff.








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544 Differential oil 444-544

posted by  someone claiming to be tommyt544 on  Fri May 17 11:28 CST 2019 [RELATED]

Some people say the diff needs GL-4 hypoid. Can anyone else chime in?








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544 Differential oil 444-544

posted by  planetman on  Sat May 18 11:52 CST 2019
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last visit: Fri Oct 24 09:29 CST 2014
[RELATED]

GL-5 is a higher grade of diff oil, like DOT 4 brake fluid is a higher grade than DOT 3.

GL-5 has more additives and can be used in your diff if you want.

However, GL-5 in not recommended in your transmission. I have read that there now maybe some versions of GL-5 that are safe for "yellow metals", ie, copper based parts like synchro cones, and that it should say so on the label.

FYI, Volvo originally recommended SAE 90 for both the diff and transmission. I use GL-1 which is the same as SAE 90 AFAIK in my customers M40 and GL-5 for their differential oil.

I get my GL-1 from NAPA.
--
Eric
Hi Performance Automotive Service (formerly OVO or Old Volvos Only)
Torrance, CA 90502
hiperformanceautoservice.com or oldvolvosonly.com







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