I've been reading a bit about all of the oil formulation/additive changes due to emissions and such. I have a car that does not have any cats or sensors that could be harmed. Are there any oils which would be better than the API certified oils in this application? Would a motorcycle oil work in this application? I'd be hesitant to use one because they are made to work with the wet clutches and may not be ideal for an auto engine. I do believe that the latest SL oils would still be best, but I'm posting this to be sure.