Originally Posted By: Garak
It won't be. It's a synthetic 15w-40. My supplier has some, but I never checked the price. I'm a Royal Purple fan, but I'm not exactly sure what they're trying to accomplish here. Granted, I'm sure they're using fine base stocks (with the -49 C pour point in a 15w-40, I'd suspect they are) and I'm sure it's a great product. Most guys going for a synthetic HDEO would be going for another viscosity, and their other Duralec line is CJ-4/SN, with 5w-40, 10w-30, and 15w-40 available. And, that line looks pretty good, too.
So, if their niche market is guys who want a synthetic HDEO but are old school enough to insist upon it being a 15w-40 and CI-4+, well, I guess they can claim that.
Amsoil AME (synthetic CI-4+ 15w40) remains a strong seller for Amsoil, so I don't see why it would not sell well for Royal Purple.