05-20-2023, 01:19 AM
(05-19-2023, 08:29 PM)GoldOxide_imp Wrote: 15W40 might be quite heavy for the CB1100, possibly even under Texas heat.
Rotella T5 is definitely not recommended for motorcycles with a wet clutch.
If you can find T6 10W40 you might be fine.
I used T6 5W40 in the heavy and hot summers in southern Ontario.
There's no T6 in 10w40.
There are a bunch of guys using T5 in their motorcycles at the oil forum Bob Is The Oil Guy. The evidence against using it seems more based on not having the MA letters on the bottle, while the evidence for it seems to be based on actual real world experience.
100 miles in and my CB1100 seems to like it, but I will definitely be keeping a close eye on it, and will update the forum with my experience.