I am looking at a 1990 300e 4matic .The car seems very good, with the only snag being shudder coming from the rear differential. VERY slight under normal moderate acceleration, heavy under heavy acceleration. also, when tight turning, the rear wheels seem to be locked together. I have seen this in other 4 matic, and would like to know if this makes the car not worth looking at for purchase. Thanks--Im new at this