After some thinking, i tot of changing my car piston. I'm using evo 1 engine now. Stock piston with big turbo setup. I'm afraid it might not last long.
My mech said use 1J or Fairlady piston, rebore...
asking on behalf of my friend, he drives a B8 Ford. He has tried quite a number of oils, but he finds the engine to be rather "rough" at 4000km. Everytime he changes the oil, everything is smooth.