Hey Gary, 20,000 miles and counting is pretty impressive! Do you run regular oil or synthetic? How many miles on the engine?
Edit: I was looking through the report again and just answered my first question.
Been running the Frantz filters since back in the late '50's - early '60's or so. My dad ran them on his cattle-hauling trucks - SB Chevy engines back then for both of us. Installed one on my first Dodge/Cummins, a '91, and started doing oil analysis to substantiate the claims made for the TP filters, and they totally lived up to the reputation, and no "TP in the crankcase", ever!
Not to say some idiot using the wrong stuff and totally buggering up the cartridge installation COULDN'T manage to screw it up...
The guys over in "Bob is the oil guy" website all have VERY good things to say about these type filters, with lab tests like mine to back them up - I've yet to see anything similar or otherwise reasonably and commonly available that will provide better filtration, and mine did so well with the oil, that I put one over in the fuel flow as well:
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The oil filtration is good enough, that even after 20K miles, the dipstick looked like this:
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BUT, that was back when I was driving a good mix of freeway/around town driving, and now that we're out here in Eastern Oregon, not many miles on the truck (75K), and what there are is mostly local trips that generate too much soot even for the Frantz filter - analysis is still good, but oil gets blacker. And also, since my truck is only 2WD, it doesn't see much Winter time driving, hard to get traction in stuff like this:
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