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Gear Oil

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Old 01-05-2009, 11:23 PM
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do we have to change it? if we do how often? how much would i need if i do have to change it? thanks guys
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Old 01-05-2009, 11:39 PM
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also where can i find the gm posi stuff? will autozone carry it?
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Old 01-06-2009, 12:18 AM
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I used just over two quarts of Royal Purple 75W90. It claims you don't need to use the posi additive since it has some type of additive in it.
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Old 01-06-2009, 08:38 AM
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I would buy the GM friction modifier. You can get it at any dealership and it is only $5.
Changing your gear oil every 10-20K miles is not a bad idea to keep it alive.
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