Which differential fluid for base V6 models? - Pontiac G8 Forum: G8 Forums - G8Board.com
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post #1 of 9 (permalink) Old 01-19-2019, 09:51 AM Thread Starter
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Which differential fluid for base V6 models?

I see the GT uses the expensive stuff with the friction modifier already in it. What is called for in the V6 and how much does it take? Can I use Mobil 1 gear oil? No mention of specs in the owners manual of course.
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post #2 of 9 (permalink) Old 01-19-2019, 10:01 AM
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Our V6's uses any standard gear lube.
It takes about a liter and a half.
Don't see any problem with Mobil 1 as long as its the correct weight.
GM dealer I went to used Castrol synthetic 75/90 gear lube.
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post #3 of 9 (permalink) Old 01-19-2019, 10:08 AM Thread Starter
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OK thanks. Wonder if 75/140 would be better in warmer climates and with over 150,000 miles?
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post #4 of 9 (permalink) Old 01-19-2019, 10:14 AM
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My GM trained mechanic son says it would work but he tries to stay as close to OEM as possible when changing these fluids.
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post #5 of 9 (permalink) Old 01-19-2019, 10:19 AM Thread Starter
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OK I'll stick with 75/90 and its cheaper too.
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post #6 of 9 (permalink) Old 01-19-2019, 10:37 AM Thread Starter
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Quote:
Originally Posted by BAS G8 View Post
Our V6's uses any standard gear lube.
Just talked to two GM dealers and they said there is no difference in specs for V6 or V8 and to use 92184900.
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post #7 of 9 (permalink) Old 01-19-2019, 10:40 AM
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^^^^ The service manual agrees with what you said
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post #8 of 9 (permalink) Old 01-19-2019, 11:22 AM
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For what it's worth, awhile ago contacted Mobile 1 inquiring if their differential fluid contains friction modifiers that meet General Motors qualifications for carbon-lined differential's and... crickets.

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post #9 of 9 (permalink) Old 02-19-2019, 08:38 AM
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Great information shared. . . .
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