請幫忙推薦比shell ultra 10W/40 更好用的機油

it's a liter bike.

i don't mind trying redline in a scooter or car. just not in a liter bike since it does not have the JASO MA specification. even though i read on BITOG and other places it was ok and people did not have a problem.

just wierd they dont have any JASO MA products and only motorcycle oil is 20w-50 for big v twins.

http://www.redlineoil.com/product.aspx?pid=109&pcid=13

i see a 10W40 ...

but I dont think its JASO MA certified either ^^"

It does state that its designed for wet clutches thou.

thanks, i found it on taiwan yahoo auction yesterday.

it has jaso mb.

API Service Class SJ/SG/SH JASO MB
Viscosity Grade SAE 10W40