I have a 94 540 w/ 78k on the clock, nikasil and runs fine but sometimes a little warmer than I would like... BMW increased the engine temp. to increase fuel burn and combat the high sulpher fuel problem....yada, yada,yada.. AND buffered the temp. gauge to the mid point so it would not flucuate as the termo. opened and closed....totaly usless now. So don't rely on the temp. gauge as a true reading of temp. after running hard and coming to a stand still. Mine is a little rough after doing so, but settles down when the temp. does. BTW the cams on the 4.0 V8 are a little lumpy