anyone have a any thoughts on mixing 4 ozs of lucas oil stabilizer{the older stuff NON synthetic}with M1 snythetic gear oil to quiet gear whine......i just had the pinion seal and bearings replaced and now the rear whines terribly above 50mph.....dealer says everything is ok...so please don't chime in the take it back to the dealer.I put the M1 in after i got it home...changing out their GM snythetic gear oil seems to help some....and the more i drive it it seems to be getting quieter....but i did notice some metal in the oil...like a real fine dark powder....this rear has NO clutches in it so the metal powder i see must be from the R&P.Thanks