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Your good. The first UOA was OA and the second was B-S. What is the difference between them?

Not 100% sure. The first one as all EA but since then there has been a mix of EA and WIX. This specific oil change was a WIX filter. Why?

EA or WIX filters which I changed at each oil fill

I posted oil analysis results in 2/05 after 41K miles which showed a significant thickening in the oil after ~12K on the oil. Based on feedback from this forum I changed the oil from the 5W-30 ASL tp 5W-30 HDD and have much better results. See below. Do any of you see any problems developing...

P.S. It is a stock 5.3L engine. No turbo I have also used AMSOIL oil filters and foam air filters since the first oil change at 3735 miles.

Thank you for the quick responses and good questions. Here is a little more background. I have used AMSOIL 5W30 starting at 3735 miles. The oil analysis was done on the third oil change using AMSOIL. It was the first oil analysis. The mileage was 41543 with about 12K on the oil. Most of the 12K...

I am inclined to see if there is an engine problem, first. I don't see myself as a hard driver and there have been no engine mods. I just can't imagine a problem that could thicken the oil and not show up somewhere else. The rest of the paramaters in the oil looked good. The gas mileage is...

Chevy Avalanche K1500, 5.3L engine Mileage 41543 Time on oil 12880 Travel was highway, no towing I am using AMSOIL oil advertised to last up to 25K miles between oil changes, or 1 yr, and 12.5k between filter changes, or 6 months. At the midway point I decided to take an oil sample for an oil...