10w-40 semi and 5w-30 fully sythetic oils are both fine to use on the IS200- choice is yours.
Don't mean to be funny mate, but is english not your first language? Can't make any sense of the txt talk above. 2 cycle or aviation engine- what are you going on about???
loool ok... 1st of all thanks 4 ur advice.. il propli tak 10w-40 mobil 1 as its cheaper..
and the point i was making is that.. i was looking at this mobil1 oil and its specification ... n on thr it said it is not recommened for 2 cycle or aviation engine?? :S so i was wondering if it applys to the lexus??? :S:S i didnt get myself whn i read tht... n i apologise 4 dat previous comment lol =]