No prob. I'm on the cusp of doing it to my X. But basically from the testimonials to the write-up, it all makes sense. Esp. since Malo was having exhaust camshaft sensor errors. If it doesn't fix the source of the problem, it definitely is a worthy repair. I currently am experiencing no problems with my X but will do it anyway. Gives me a chance to replace the valve cover gasket. My X (M54) has 87K on it and my E39 with the M52TU motor, the valve cover gasket was like hard plastic instead of rubbery that it just broke into a million pieces when I tried to pry it off the cover. I'm sure it needs replacing in mine.