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I tell my clients that as a general concept LSD additives are NVH items. They make the gear oil more slippery which quiets the often chattery clutches of many oem and even certain aftermarket Lsds. But from a performance standpoint they make the LSD bite less.
That is why many in racing use an oil like Delvac. It has great high temp protection qualities and gives the LSD the best bite possible. There is no reason to use a different gear oil in your street car unless you find it too noisy or you have an issue with cold weather balky shifting on warm up.
Both GM and Motul make little bottles of LSD additive that you can add to whatever gear oil you like. Add them 1 oz at a time and see what changes you see. A little goes a long way.
Regards,
Matt Monson
Guard Transmission llc
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