: I agree with the other guys here. If the engine has been replaced to an Alusil block then it should be oke, otherwise keep an possible engine replacement in mind ! Nikasil was used in the 94-95 840,540,740's 4.0l V8 and had a trouble due to high sulfur in the US petrol. 96+ used a 4.4l engine with an alusil block which is more stable. Check the warranty first and the compression in the engine and then decide. Any reputable dealer would let you to take a car to a BMW shop. Don't listen to the dealers tale : this engine last forever, nothings wrong with it, etc. It was a serius problem and BMW didn't have a quick solution to solve it, so even the engine was replaced it was the same nikasil block ! Funny though everybody is blaming the nikasil to be a weak material, and Ferrari using a nikasil block since 1980's and most of the high performance motorcycle engines are Nikasil as well. The heat is what could dissolve the high sulfure and those engines were running to cold. They had raised the engine tempeture and it did help a lot, but wasn't a sure solution. BMW used a too thin coat also and partially this was a problem. Anyway the Alusil is stronger and better for the high-sulfure content gas. Also just read somewhere the US will reduce the sulfur content in the gasolines. It was too high compare to other countries and caused many problems. Also for soem reason it was good for the older engines and that was their reason. Now old car owners beware the new reduced sulfur fuel might destroy your engine.
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