I just spent the last 45K miles doing samples every oil change over more than a full year to get the data for seasons and break-in to broke in.
I found the same thing to be true. Something was always teetering on done or had stepped off the cliff long before the OLM was DOA. In fact, I found about a thousand mile difference between summer and winter. That is during the winter half the OLM was STILL too long. Even the severe schedule was to long in the winter.
Now having done the work I can say I was NOT DISAPOINTED. I saw nothing I didn't already know. Nothing my father hadn't already demonstrated in his 2K OCI's pushing dated iron on dated oils and weak filters to mileages well beyond 300K.
Building on his work through use of Lab testing it wasn't hard to find the correlation between 'sight/feel/odor, the things dad relied on, and test results. Use of current viscosity stable chemistries & filters has pushed that marker for my motors out to 3K summer, 4K winter.
So the early lies were 3K on conventional oil and the lie upon the lie was 7K+. turns out to be off by a factor of two.
So... it is true that modern chemistry has doubled the useful oil life. But the base milage that came from was off by double. It's how good lies work. Partly true, sometimes mostly true so that your meter isn't set off. It also means that non-shear-stable shelf oils are only now as good as the old oils were in their best case scenario.
So the question now is how do we improve on that? Thus the question into cleanliness among the other items listed in the post quoted below.
If this bores you, feel free not to participate.
Is it though? Like LTZ, not a high take rate. Current Sierra has AT4, Denali and Elevation as its main bread winners. Each trim accounting for 25-35% of sales for Sierra. SLT makes up about 10-15% at best.
Like others have predicted here for GMC, it will be:
- Pro (equal to WT Chevy)
- Elevation (replaces SLE and SLT)
- AT4 (and X)
- Denali (and Ultimate).
Coming back to this question, *my* answer is no, it's not something about which I'm knowledgeable. I'd need to read up on it and understand how it applies to we the consumer and our oil change regimens.
One of your bolded points is that fresh oil in a container contains particulate matter. I don't think I'm surprised, maybe a little bit that it seems to be a major factor, but there's manufacturing process involved in oil and it doesn't exactly come in sterile packaging.
How much is filtered out on the first start by an acceptable quality filter (AC Delco, as a baseline) filter?
On the GM OLM discussion, just saying that the "number of engine revolutions" appears to be a factor in oil life... cough... maybe driving style *does* matter.
GMC has been revising their trim level names over the past several years. Sierra Pro has taken over the Work Truck/SL trim name; Elevation has replaced the SLE (and with the Premium upgrade, SLT) in the SUV lineup of late; AT4/AT4 Ultimate and Denali/Denali Ultimate have been the top of the line in off road luxury and on-road luxury respectively for the full-size pickups and SUVs.
SL, SLE, SLT nomenclatures are gone in the Sierra truck line. Mark my words.
GMC has been revising their trim level names over the past several years. Sierra Pro has taken over the Work Truck/SL trim name; Elevation has replaced the SLE (and with the Premium upgrade, SLT) in the SUV lineup of late; AT4/AT4 Ultimate and Denali/Denali Ultimate have been the top of the line in off road luxury and on-road luxury respectively for the full-size pickups and SUVs.
SL, SLE, SLT nomenclatures are gone in the Sierra truck line. Mark my words.
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