Skeptic Posted: 5/16/2009 12:27am PDT "What are you smoking?" "Even BMW has said its next M5 will replace the current turbocharged V10 with a fire-breathing turbo straight six." BMW uses a normally-aspirated V10 in the M5/M6 and a V8 in the M3. Speculation is that the M3 will return to a six-cylinder, in turbo form. It's a safe bet the M5/M6 will get a version of the new turbo V8 in the X5/X6M. R2dad Posted: 5/15/2009 2:48pm PDT "But..." As long as gas is still under $4/gallon, americans will continue to buy cheap pushrod V8s.