Originally Posted By: Pablo
Yeah, swap filters top up the oil and go another 5K, at least.
This is what [censored] wrote back to me. I think it was something in my pump that got some crud in there. They said everything else looks fine, so like I said. I installed a mitsu filter (just because I have 3 on the shelf) and will run it again until the end of the season and sample it when I change it for the winter.
John,
Insolubles are solids in the oil; these are typically from the oil oxidizing and creating solids (carbon), but can be from other solids, like metal or grime. We didn't see any evidence in your case that they were exclusively metals or grime. Also, if the insolubles are strictly from oxidized oil, this 0.6% isn't really a problem amount, it might just show a bit of sludge inside the engine. Excessive fuel or coolant contamination causes oxidation to accelerate, as does excessive heat. There were no signs of any of these items in your oil. So in your case, it appears to be just from a little extra sludge, which isn't uncommon or necessarily harmful. If insolubles are too prevalent, they can be abrasive, just like metals. There is no sign that insolubles affected wear here at all. Hopefully, within the next few oil changes those insolubles get down to the normal range. Air filtration shouldn't really affect the insolubles reading.