Which motor oil to use after in frame?

[Rawze]

CI-4 oils are better oils but Mr.epa does not allow them to be sold in quantities less than 55 gallon drums any more I think.

CI-4 oils have too high zinc levels and wash out the precious metals in after-treatment systems, making it harder and harder for them to do their job.

CJ-4 oils were the solution to this,.. but now Mr.epa is still not happy, so they are stripping even more away from oils by 2017.

Soon, gear oils will be the only oils left with decent additives in them, but you got to watch out for sulphides in them if more than about 10 - 12% is put into your engine.

I think it is going to come down to people buying their own additives and putting them in before it is over with. only problem with that is there are more "snake oil" products out there than good ones.