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Joe,
I'm using Certified Labs STRATA XL. It is a straight mineral based oil! I changed it to STRATA XTREME which is a blend. I expect that to last even longer! No, I didn't change the filter because the contaminants were kept in check. They can either come from internal sources or external sources. Interally the deposit formation is held in check with good chemistry, externally I changed my air filter twice and very good about not contaminating my sampling port which is my dip stick tube.
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Michael D. Holloway
https://simple.m.wikipedia.org/wiki/Michael_D._Holloway
https://5thorderindustry.com/
https://www.amazon.com/s?k=michael+d+holloway&crid=3AWD8RUVY3E2F&sprefix= michael+d+holloway%2Caps%2C136&ref=nb_sb_noss_1
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