UOA results @ 276k
Comments — “The potassium and sodium that show up here could be from hydroxides used to process the waste vegetable oil (harmless), but both are also components in coolant. If coolant is in the oil, it doesn’t appear to be much. However, we suggest monitoring the coolant level, just in case. Most metals stayed put since last sample, but lead increased a bit. This could be from a temporary particle streak through bearings; if so it should drop next time. The TBN read 6.7, which shows plenty of active additive left. No fuel or water was found. Try 9K miles on the next oil.”
