BlackStoneLabs said:This sample has us concerned about coolant. We look for coolant via potassium and sodium. Silicon sometimes shows up too, and we have all of them here. It's not quite enough potassium and sodium to call coolant for sure. Silicon could be abrasive dirt getting past the air filter or a harmless sealer if any work was done recently. Sodium could be residual additive, but Amsoil doesn't use it. If you've always run Amsoil this probably is a trace of coolant. The TBN is fine at 2.5. Wear is still low, but run just 5,000 miles on the next oil to monitor.
Interesting. Maybe some coolant spilled when swapping heads? Is this the first change since heads were done? Imo, it doesn't sound like something to be concerned with, just monitored occasionally. Let us know what you find.
Thanks for the email. Since you just replaced the heads, maybe this is just a little residual coolant from before the repairs were made. Most of the silicon is probably harmless sealers still washing out. That might explain why it was so much higher than potassium and sodium. Hopefully all three elements look better next time.