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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. -
By GMTruckGuy74 · Posted
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. -
By GMTruckGuy74 · Posted
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. -
I'm having similar issues, though, mine is more like a 50% success rate. I've cleared cache, restarted both phone and infotainment system, and forgot and repaired phone. Mine does work with a cable, but frustratingly very hit or miss with Bluetooth. It's a 2025 and worked reliably until about six weeks ago. Suggestions greatly appreciated. -
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