I don't think this can be true as the NAPA synthetic does not have any diesel ratings. I only see SL on the back of the bottles I recently bought (for $2.69
Yeah, I forgot all about Rotella T synthetic. I think that's a better idea. I'll run it for 6K miles and do a UOA. That will give me some piece of mind because its thinner at colder temps (is this correct?)