Quote:
Originally Posted by StreetRage320
why do you ask? did your engine fail due to the filter collapsing?
if you are not having problems, I would just switch to an appoved Dexos oil. I personally only use Napa Platinum as they are true absolute filters. Many filters are nominal, so a 23 micrcon nominal has an average micron opening of 23 micron or less, and 23 micron synthetic (absolute) has no openings larger than 23 micron.
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I'm asking because it seems GM scrutinizes the oil changes, especially the L99's which I have.