Chevron Delo400LE 15-40 still has decent levels.
Any idea how long Mobil 1 15W50 will keep the high level of zinc and phosphorus?
So what's it got in it, PPM for each?
CJ-4 Rotella got reduced to about 1100 ppm of zinc, from about the 1400-1500 range of CI.
Ph went under 1K...
Apparently there aren't enough on the road to keep it from getting reduced. :glasses7:
Hmmmm, it's been a good number of years since I had researched that info... Now that I have RE-looked up the data again... You seem to be quite correct crackedback... I guess there aren't enough Old DIESELS on the road and (as you said) they have reduced "zinc" a bunch... I may have to switch to the OFF ROAD racing oil after all... I'm still against "additives"... but that line of thinking may also change for me. Though, I still do have a few "old" gallon jugs of the Valvoline Premium Blue left and LOTS of Mobil 1 15W-50 w/zinc.
So this thread has been enlightening and informative for sure... else I would have gone on thinking nothing had changed... I miss the old days when we had "LEADED" Fuel, lots of "ZINC" in the ALL Motor oils... And more and more the "STEEL" in cars is being replaced with plastics and now my Doc is telling me I have an "IRON" deficiency... What is with this "Metals" thing???
Guess I'll quit giving my Two Cents anymore (there goes the "COPPER" as if that is real anymore) Sigh~
Clif of Az. Retired... :coffee2::glasses7:
I always recommend a additive! I never trust the oil company's. That's how we got into this mess. The highest mileage engine I put together. Is a performer cam'd (flat tappet) 468 in a dualy. It see's regular horse towing duty. Going on 120,000. Every oil change is Rotella with red line additive. My two cents, from my experience. To date every motor I have built, has been because of a flat lobe. The owners didn't know they had to add any ZDDP! Again, this is just from my experience.