hi,I knew why u asked for it;car eng. oil is so much cheaper & come mostly in 4/l. but bear in mind car about 2k rpm/m. cycle allways above 6k rpm.there's some sp. additive chem. add to m/cycle oil (spec comes with API SJ,SK,SL,SM,SN being the highest/ also JASO MA2(Jap.standard) U can buy at ntuc 4-stroke fully Syn. Motorcycle oil at 9.9(7.9 when offer;must be quick because i be the one to sar-poo liao. Ha-ha-ha & good luck,do i ans. yr. Qstn?