hey guys

noticed that my 2000 s2000 with 107,000klms on the clock is burning up the engine oil!
im using the mobile fully senthetic 10-30....in the time i did 4000klms it burnt up like 2L!
whats wrong?....oil too thin or the rings f*cked on it?
mods are: xforce headers, full remus system and k&n cai.