It will clean your diff out I know that. I changed mine with Valvoline SynPower when I first got the car then the axles both went and Red Line Shockproof was what was put back in. The shockproof may have been overkill.

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'02 BMW 325i
'85 300D 450k
'93 190E 2.6 170k(killed by tree)
'08 Ducati Hypermotard 1100S 6k
'06 Ducati S2R800 14k(sold)