hi all, this only my 2nd post here... what to say, so far satisfy with my waja cps apart from rattle a little here and there... hehe

i'll be doing my 30k service soon. thinking of changing to full synthetic syntium 3000 5w40.

however i went thru the manual, says if change to lower lubricant (from recommended 10w30), will avoid warranty.

1. may i know is 5w40 is lower or higher? really don't know about lube oil.

2. if change to 15w50 full synth, will there be any effect? manual says 10w30 or higher.

thanks for all experts advice.