Hi all got an MG ZS 180 2002 with 72000 miles, and it has started recently making what seems to be a tapping noise at all engine revolutions and temperatures. Im an advanced driver so do maintain revolutions quite high all the time but generally speaking most cars thrive on this kind of treatment. I put in GTX Magnatec to try to lubricate the valves and pistons and eleviate the noise but to no avail. I have also noticed flat spots on several occasions which has required me to fully open the drive to overcome the problem. Another symtom I feel is worth mentioning is I can hear what sounds like the inlet manifold sucking quite hard when at slow speeds. This is my first V6 so not sure what to do next. Your help is much appreciated!