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Old 01-14-2008, 07:56 AM   #1
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Location: Memphis, TN
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Friction modifier

To A preson running amsoil. Do I need to put in friction modifier in with gear oil. Some say yes others no. I and just confused. Royal Purple says I dont need it. Amsoil sight says I do. 2004 5.7L - 4X2, QC-limited slip diff. Am also looking to put a bypass oil system on the beast any suggustions. Got the k/n drop in filter, little by little she will be a screamer

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Old 01-14-2008, 08:46 AM   #2
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Friction modifier

I used the Royal purple and did not add the modifier. I have 45000 miles on since, towing a 9200# trailer occassionally and alls well so far. PM bigArt as I think he's an Amsoil dealer that can really help you.
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Old 01-14-2008, 12:12 PM   #3
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Friction modifier

I use the Mopar additive in RP...I think Amsoil has a diff fluid that doesn't need the additive, but Art can verify this...good luck.
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Old 01-15-2008, 08:52 AM   #4
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Location: Prairieville, LA / New Orleans, LA
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Friction modifier

I use Amsoil and have used the modifier---no problems with my 3.92 limited slip--124,903 miles
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