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x2 on fuel starvation. Everyone I've heard of running 100% is preheating the fuel tank. Try 66-75% oil with remainder being diesel fuel, it doesn't take a lot of diesel to have a very noticeable thinning effect.
As for your pump, I would recommend springing the relief valve in the oil pump to a low pressure (20 or so psi) and installing a gauge between the pump and your filters. Like 94_turbo mentioned, the harder you force it through, the more large particles you'll pass through the filter. Also, I used the rope wound filters at first but I now prefer these "spun bonded polypropylene sediment filters" I found on ebay. I bought a case of like 20 for $40ish. They're supposed to be 1 micron and they appear to be VERY dense. When I was using the 5 micron rope filters as my final filter (had a 20 micron primary) I had some fine black sediment in the bottom of my plastic gas cans I was carrying in the bed for extra supply on long trips. I haven't tried the test again, but I figure it has to be somewhat better.
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1986 F250 2WD Super Cab XLT Lariat w/ 1996 front clip. Dually bed & van rearend (2" wider, allows spring clearance). 6.9 w/ approx 120,000mi. Banks non-wastegated turbo system, Wellman G088 glowplugs, Delphi BB injectors, Kenworth pyrometer, vac/boost gauge, electric water temp/oil psi/voltmeter mounted in dash. 3" Mandrel-bent open exhaust. C6 trans, 3.54 gears. Okiegringo idler pulley. R134a A/C conversion. WMO/diesel blend in one tank.
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