Originally Posted by dustyroads
Originally Posted by bbslider001
And yet more reasons I will be sticking with ST 15w-40. At least it's still CJ-4 for my dinosaur 7.3 PSD. I hope they don't convert soon. Why in the heck are the oil companies doing this crap?
I used Supertech 15W-40 ( in OTR trucks) for a few intervals back in 2012-2013 and it worked fine. The TBN dropped much lower than the name brand oils, but otherwise worked great. For the short OCIs you're doing, anything is fine. Supertech is CJ-4 and I think it had the heavy duty engine builder's approvals (?)
However, I can't understand the dismay you and others have towards CK-4. Only some of the CK-4 oils are SN and those that aren't, likely have the same phosphorus/zinc as the old CJ-4.
With CK-4, you get improved aeration control, better oxidation control and strong TBN. I have put up some really good UOAs with the dreaded CK-4/SN (with the API limited phosphorus). My OCIs include many many miles, many gallons of fuel burned and crazy hours accumulated all while staying loaded for 94-96% of the miles. No way I would do what I've done with CJ-4.
CJ-4 and the engine builder's approvals of the day were fantastic. The thing is, the CK-4 and new (tougher) engine builder's specs have improved performance that benefit anyone. I'm taking advantage of the new oils and saving myself a lot of time and money. The SN part of it hasn't been a problem whatsoever. The oil has to meet the new specs regardless of the strategy each oil blender uses.
Sorry... I've been a shill for CK-4 and it's been a while since I've said anything about it.
I don't have a problem other than the sheer drop in numbers in the add packs for the ones that count. (Zinc, Magnesium,Phosphorus all cut in half!!!!) for example. Calcium is doubled, but the rest are axed. I am just looking at the numbers. I guess they seem to be working fine. I am sure I will have no choice pretty soon but to use CK/4 because that is all that will be available. Maybe I am misunderstanding the VOA that I looked over? I am at least glad to hear your real world account in that they seem to be working just fine.