Originally Posted By: pwr2tow
Just my thoughts here.
I see no reason why the CK4 formula would not be o.k. in a motorcycle. If it's good enough for modern diesels with their tighter tolerances, turbo's, extreme torque, high horsepower, and higher running temperatures. I remember back in approximately 2006 when everyone was flipping out about CJ4 and it possibly being no good.
With this type of scared thinking we should all move back to the sludge building, less wear protection of CF classification.
Each newer oil classification is brought on to handle tougher more extreme engine conditions.
Oh, I agree for sure on the above. CK4 is made to be backwards compatible with all previous classifications. It should be a no brainer.
With that said, the new oils are being formulated with less zinc/phos for these new modern engines, what bothers me (right now anyway) is these oils are developed for and tested on automobile/truck engines. To give credit to the CK4 I think Harley Oils have less zinc/phos now anyway.
As we all know, in decades past, there have been issues with some new oils and old tech engines, Im just saying, Ill let someone else use their motor to test it, as well as Harley Davidison before I use it, I mean why not? Yet I am not at all in a panic over it.
BTW - Ford Motor Company has just come out with a statement regarding and reporting excessive wear in some of their new diesel engines using CK4 oil and suggesting to stay with CJ4, on top of it, they just came out with a new Ford Requirement for CK4 oils. There is a youtube link somewhere in these forums, good luck with that *L*
Anyway, I agree with you and not speaking out against CK4 in anyway, just giving my reasons that I would hold off in my Road King, I doubt very much there will ever be a 15/50 or 20/50 CK4 oil made anyway, so I dont have to give it much thought.