2009 Toyota Sienna, RLI 0W20, 13,356miles

[Jon]

Thanks for pointing out that post, Garak -- I found it informative.

For me, this is mostly interesting -- I *have* had UOA's find coolant (and the subsequent investigation found a just-started-to-leak headgaskset), and even items like a fuel injector that would leak down over night. So it's been useful to me, but I'm not under any illusion that without trending the report has limited utility.

Still, hearing what other people think is still very interesting!

 

[Garak]

Oh, absolutely. If your viscosity is out of whack, or your TBN is down to nothing, or you've got a big slug of sodium and potassium, or you've got monumental fuel dilution, then an individual UOA has done a fine job. But, I can't make any judgment call on iron from one data point.

Maybe call into RLI themselves. From what I understand, they're very forthcoming and approachable.