Historically I’ve run about 2 to 1. So two oil changes in the time it takes the OLM to tick over once. I only reset them when the truck starts reminding me to get an oil change and have no use for them.
In no cases has the oil I’ve sampled been fit to run twice as long so the OLM is bunk across GM and other makes/models.
My experience is that there’s ALWAYS something. Either the TBN is ready to fall off the cliff, fuel dilution too high, viscosity down (shear or dilution). But I suppose if you never actually test, you wouldn’t know.
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