prob'ly been asked before, but...

[eurobykz]

owner's manual for my '04 Girly says Mobil 1 Racing 4T fully synthetic 15W40  API/JASO bleah bleah

15W40 doesn't seem to exist, at least not in my part of the world...

any insight?

ian

[Andyrew]

I just filled with 5-40 Shell Rotella T6 available at walmart. Its one of the few synthetics without additives and are safe for motorcycle wet clutch's. Its widely used in the motorcycle community.

http://www.walmart.com/search/search-ng.do?search_query=Shell%20Rotella%20T6&adid=22222222220202569902&wmlspartner=wmtlabs&wl0=e&wl1=g&wl2=c&wl3=21972331487&wl4=&veh=sem

[Mustang]

mobil 1 4t racing synthetic is 10w40 now ..............
and the mobil 1 for milwaukee vibrators (H-D)is 20w50 . I like the 20w50 for summertime

[Andyrew]

Does the 20weight help with shifting being a thicker oil? :) I'll gladly change over if thats the case..

[Mustang]

Does the 20weight help with shifting being a thicker oil? :) I'll gladly change over if thats the case..

short answer .........no

you need to master that