Do the engines with sulfer damage burn/use oil? It seems that if the cylinder walls are harmed to the point that the engine doesn't have enough compression to start that it would burn oil. My 540i doesn't use any oil so I'm looking for a little peace of mind. I put Amsoil 20/50 in 7,000 miles ago and I've used only 1/4 quart. The car also has 114,000 miles so warranty repairs are out of the question.