I am using some on sale Napa 0W20 oil in a 3.5 V6 Toyota that holds about 6.5 Quarts. The owner's manual says 10,000 miles or 1 yr max interval. I know only a UOA could tell me for sure, but is NAPA Full Synthetic capable of 10,000, 7500, or 5000 intervals? Until this run, I have only used TGMO at 9-10000 miles intervals. Thanks