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I changed my fluid at approx. 8,000 miles. I used 1 quart of Amsoil and 4.5 oz of GM posi additive. The owner's manual actually recommends changing the rear end fluid @ 3,000 miles if the car is used for competiton/racing. I don't race my car so changing the fluid at 8,000 was more like a peace of mind for me. Plus, it gets rid of excess metal shavings from vehicle break-in. I also wanted to add good quality stuff like Amsoil. The process is as easy as changing engine oil so I figured, why not?
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2011 Summit White Camaro 1SS/RS
-6.2 LS3, TR6060, 3.45, G80
2004 Black Silverado 1500 2WD Regular Cab, Short Bed
-5.3 LM7, 4L60E, 3.42, G80
2014 White Caprice PPV
-6.0 L77, 6L80E, 2.92, G80
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