conversely, what often happens is that with Rotella: or other oils designed for Diesels, is that they're formulated for typical diesel engines to which have a redline of about 2500 RPM.The oil can froth and foam if it isn't correctly formulated....
+1. Pick a good, reputable oil and filter, and change often and regularly. I think everything beyond this is in the realm of pure theory.All those oil issues from the past just ran through my mind. all those discussions were so much fun. I think we decided to stick with 10-40 on the liquid cooled engines, and every oil I ever heard of was discussed and some I hadn't heard of. I use syn. and just found out this yr. that my dealer uses Motul, for what ever reason. Supposed to run cooler etc. I still change at the beginning of the riding season and after long trips and at the close of the season, no particular reason other than it's easy to do, I enjoy it and it's not overly expensive. Nuff said from me.
That simple concept shouldn't give anyone any problems.I have always used whatever oil the owner's manual calls for. Manufacturers all cover new bikes under warranty and the last thing they want to do is pay a dealer to correct engine problems. I'm sure they pay their engineers a lot of money to safeguard against having to do so...seems like a simple concept to me.
Interesting theory, but Rotella is JASO MA certified and I very much doubt that the anal Japanese would approve anything that would destroy the seals on their engines or froth and foam in a deleterious manner.conversely, what often happens is that with Rotella: or other oils designed for Diesels, is that they're formulated for typical diesel engines to which have a redline of about 2500 RPM.
When that said oil is used in engines that have redlines of over 7k RPM, or (god forbid) in sportbike engines that have redlines of 13k or higher, you'll find these (intended for diesel) oils will froth heavily and not offer the fluid film protection you'd have for oils actually designed for these applications.
Not only that, but as most people know, diesels run very dirty with heavy carbon fouling that occurs. These diesel specific oils are often laden with scrubbing additives that are very harmful for gasoline engine seals, of which are not designed to cope with these scrubbing agents. So its really not often to see higher KM gas engines that have leaking seals if these typical Rotella type oils were used consistently.
I remember having this convo with my dad when I was 16 trying to explain these things, since most of our gas engines at the farm were leaking all over from failed seals and premature wear. Finally one day he tried using nothing but conventional oils in the gas engines and ever since we've never had the problem replicate itself.
While its true, higher viscosity oils will have a stronger fluid film strength, (which is ideal) but often the smaller passages in the engine restrict the flow to these thicker oils, which almost defeats the purpose.