Rotella T is for diesel engines and heavy equipment.I have run Amsoil in my previous bikes without a problem. I am currently running Rotella T Synthetic in the RC and it works fine...
Loads of guys use it on the FZ1OA forum without a single problem, it is cheaper than most other reputable synthetic oils, and it meets the specs described in the owner's manual.Can I ask why you switched?
Sorry, I have to. It's bugging me haha There's no dash in VTEC and there's no h.Have been using Amsoil 10w-40 for both the VFR and RC51. Makes the clutch action even better, if that's possible. My 96' Subaru Legacy used Ow-30 for over three years now. You can order Amsoil from their website or 800 number. I have had various distributors over time, but if I don't see them at motorcycle racing venues, I just buy online.
Motorcycle Consumer News did an extensive two-part test of 40 motor oils, synthetic blends, and full synthetics, 5 to 7 years ago. Royal Purple and many other synthetic did just fine, I liked Amsoil for its overall performance package.
I change oil annually, regardless of mileage, for all my vehicles.
High temperature breakdown is my major concern living here in Sacramento and riding hard in to mountains as often as possible.
I have never experienced any oil usage in the Hondas at this point. VFR v-tech has 40K on it. One durable machine, totally over built in many ways.
You should also upgrade your oil filter to a mixed media unit such as Bosch Premium. They will remove the smaller micron particle that other pleated units won't. See VFR World or VFR garage for the non OEM oil filter discussions. The same filter works for all Honda spin on units.