Experimenting to see if R&P can dissolve the suspected varnish causing a noisy valve lifter in my Volvo. See this thread for more backstory: https://bobistheoilguy.com/forums/t...0w-30-short-604-mile-run-with-seafoam.394968/
Did a filter change and pulled a sample out of an abundance of caution at 2000 miles. Filter caught minor fine carbon grit but nothing too strange. A bit less than with the MMO at similar interval, but that may indicate there's less of that material left to remove. There were a couple tiny flecks of ferrous metal in there, but that may have been from the utility knife contacting the filter media end caps as I cut it out.
Oil report came back looking great as well. Very low wear metals, though it seems this engine has a penchant for shearing oil that I'll want to keep an eye on. I'm running stock boost and tune, and the oil did not see any temp excursions or sustained high RPM either. Hot oil pressure at both idle and cruise are very healthy so I'm not too worried at the moment. No noticeable change in oil pressure with new filter so that wasn't causing a measurable restriction.
Oil is darkening faster than it would with other oils, but not excessively so. Can see a faint soot ring of ultrafine suspended material, but the insolubles measurement is low so the bulk of the mass is either dissolved completely or large enough to get caught in the filter. I'll run this out to the factory interval of 5k or so, then go for round 2. Looks like I can get away without the mid interval filter change on subsequent intervals.
Did a filter change and pulled a sample out of an abundance of caution at 2000 miles. Filter caught minor fine carbon grit but nothing too strange. A bit less than with the MMO at similar interval, but that may indicate there's less of that material left to remove. There were a couple tiny flecks of ferrous metal in there, but that may have been from the utility knife contacting the filter media end caps as I cut it out.
Oil report came back looking great as well. Very low wear metals, though it seems this engine has a penchant for shearing oil that I'll want to keep an eye on. I'm running stock boost and tune, and the oil did not see any temp excursions or sustained high RPM either. Hot oil pressure at both idle and cruise are very healthy so I'm not too worried at the moment. No noticeable change in oil pressure with new filter so that wasn't causing a measurable restriction.
Oil is darkening faster than it would with other oils, but not excessively so. Can see a faint soot ring of ultrafine suspended material, but the insolubles measurement is low so the bulk of the mass is either dissolved completely or large enough to get caught in the filter. I'll run this out to the factory interval of 5k or so, then go for round 2. Looks like I can get away without the mid interval filter change on subsequent intervals.
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