Originally Posted By: mjoekingz28
That AF looks like a Fram- not an ACDelc.
Good observation! The filter is actually a Napa Gold 2488 (Wix). When my truck was new, the first UOA came up with a very high Silicon reading (over a 100), so I immediately took the OE GM filter off and installed the Napa. Made no difference to the high Si readings. What I did during the recent filter change was to reinstall the original filter that came with the truck. This GM filter has a black rubber seal, not blue.
The figures I posted were correct, the filter has 130k km/eight years of service on my nine year old truck with 140k km on it.
The Si readings have been steadily coming down over the years, with the last UOA, a month ago, at 13ppm. Not sure of the source of the Si. Gasketing? I will start a new post on that.