hi fren out there, i just my engine to BT 20v two month ago but now my notice that my engine eat motor oil. i have check myself there was no leakage. then got no asap putih come out de. any one know what happen to my engine????? some fren say valve seal need to change but how much it cost???? in another fren say maybe the motor oil not suitable wo/ i just use semi syn oil only ma but got effect one meh????? please help. thanks