just suggesting to the all sifu and otai in MLOC, it's good to have guideline for newbies like myself in case anyone interested in buying evos (1 to 10). For example like darkchild do in Skyline Forum...
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.