Pennzoil 15 year 500,000 miles protection claim

Well, this was my go-to oil, and I’m on year 16 but only 270,000 miles. During that time however, we went through API SN, SN Plus, and SP and there was no Dexos yet. The engine is a 6.0 LS. No AFM, no direct injection OHV. Barely ever above 3500 rpm. I pulled the pan at about 270,000 miles and there was about a 1/4 inch of sludge at the bottom of the sump.
 
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