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Old 08-27-2010, 07:39 PM   #1
adub
 
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Diff Fluid question

I changed my diff fluid at 5700 miles, it was nasty with lots of shavings on the magnets. I replaced it with 1 quart of Mobil 1 75W-90 which includes LS additive. I noticed that that car groaned during low speed turns, so I turned around and went home. Drove maybe two miles. Bought a bottle of GM LS additive and put about 1.5 ounces in. Drove the same two mile course and it doesn't groan, but it whines now. Whats the deal, doesn't seem like anyone else has had any trouble with non GM diff fluid?
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Old 08-27-2010, 08:10 PM   #2
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Royal Purple is what I put in mine, nothing wrong with it at all.
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Old 08-27-2010, 08:36 PM   #3
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Quote:
Originally Posted by adub View Post
Whats the deal, doesn't seem like anyone else has had any trouble with non GM diff fluid?
When I asked my dealer for a bottle of GM's diff fluid they pulled out a bottle of Mobil 1.
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Old 08-27-2010, 09:14 PM   #4
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When I asked my dealer for a bottle of GM's diff fluid they pulled out a bottle of Mobil 1.
HA! It only does it at low speeds, like parking, so I dont think its too serious. I'm thinking I may try to find some 75W-90 without LS and then use the GM additive.
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Old 08-27-2010, 09:48 PM   #5
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Royal Purple Max Gear 75w90. Needs nothing else added. Or the GM lube with adding the GM additive. I wouldn't mix and match something that already has an additive and then add more additive. RP works great, I'd go with that.

Then go to a parking lot and do about 10 slow figure 8's. That works the additive into the clutches. If it still whines or groans after that, something is boogered up.
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Old 08-30-2010, 07:43 AM   #6
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Then go to a parking lot and do about 10 slow figure 8's. That works the additive into the clutches. If it still whines or groans after that, something is boogered up.
That quieted it down, thanks
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Old 09-02-2010, 11:29 AM   #7
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Yep, you always need to drive tight circles in both directions (or figure 8's) after changing the diff oil. That's very important, you can damage the differential if you forget this step.
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Old 09-02-2010, 06:56 PM   #8
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adub, now that you're good can I threadjack? If so I want to ask why people are changing diff fluid so early? I see you said you had shavings, anyone else?
thanks.
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Old 09-03-2010, 07:58 AM   #9
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Yeppers I changed mine and had crap on my plug and such as well.
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Old 09-03-2010, 09:07 AM   #10
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adub, now that you're good can I threadjack? If so I want to ask why people are changing diff fluid so early? I see you said you had shavings, anyone else?
thanks.
Changed mine at 2500 (I'm anal about changing fluids after a "break-in" period). No, there is no "break-in" period defined by GM but I have been around long enough (was a tech for 20+ years) and had enough vehicles to see it all. Cheap insurance and you know that the fill level is correct!

No shavings but the fluid was silvery. Looked almost like liquid silver! There was fine silver powder only on the drain plug....
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