Cummins, Ford, GMC spend millions in testing and design of their products. I’m betting they know what works and what don’t.
And
@Diesel Gunner
Maybe. History is also littered with their minor and EPIC screw ups. The people who know
may get overridden by Bean Counters, marketing, etc.
GM is well known for their R&D being: "what's in your wallet" as they turn things loose on their unsuspecting customers. The older AFM, Active Fuel Management, cylinder deactivation engines are known to clog the lawnmower engine sized PF48 oil filter and get low oil pressure warnings... Some FCA vehicles also use, and clog, the PF48 oil filter. If the silly small filter doesn't contain the timing chain debris as it comes apart on some 3.6L GM engines with cam bearings as part of the head: the engine requires replacement. It's more cost effective than trying to rebuild with new heads, cams, and clean out the oil passages from the filter in bypass. As well as hope you got all the debris or the engine is coming right back out.
Marketing approved where the older stuff was specified: Allison
now doesn't recommend the thinner Dextron 6 in their older GM pickup HD transmissions due to seal compatibility.
FCA isn't innocent with some revisions to the "Zero or Hero" EcoDiesel oil specs.
The ultimate "oil failure" is engine oil sludge. Several Dodge, Toyota, and other engines are known for this even today like: The Chrysler 2.7L Engine notorious for catastrophic engine failure as a result of oil sludge. The Dodge Durango 4.7L is also known to die from oil sludge.
Things, like oil, also change as you couldn't run a modern gasoline engine oil in a classic flat tappet V8 very long esp. a classic hot rod with high spring pressures: Well known you would wipe the camshaft. I hope modern Diesel oil specs stay compatible with the flat tappet cams of the older Cummins Diesels. This was my gamble over a 2019.
The Diesel "fuel oil" failure is under a recall for the 2019-2020 RAM Cummins. They should have known, but, someone ignored other CP4 failures, specified a Diesel fuel spec that simply isn't met everywhere in The USA... Whatever it wound up on a 6.7L Cummins. In this case
because of internet forums you could get some information about "the odds" of them actually knowing and able to be applying "what works and what don't" before walking in the door of the Casino to bet money on say a CP4.
Why is copper and silicon trending upward? Are the sample dates in the same general time frame?
Good question. This lab's reports read with the newest sample on the left and history off to the right. Service Meter reading = Odometer. Fluid run time is miles on oil. The factory fill sample is on the right. So the trend is actually going down from brand new. Required 6 month oil changes as a timeline.
And yes I recall 20W-50. I have used 15W-50 Diesel oil not that long ago to help hot oil pressure with worn cam bearings on a GM IDI. I have also lifted a generator off the ground by it's starter rope when it was 32F out and had straight 30 in it.