I once looked at buying an otherwise very nice car from dealer. It had the M272. Dealer told me that only a small percentage failed (he was trying to SELL car). I found out that he was partly right, but the problem was that MB had no record of which engines received the bad parts. I decided to walk away. And the engine should not run rough. Recommend you find a better car to buy.

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Graham
85 300D,72 350SL, 98 E320, Outback 2.5