Green coolant, using luberfiner test strips. The colors are fine, nitrites are good, freeze point is -60, and ph is 8(whatever is in the middle).

But the nitrite test is very spotty, hard to explain. Very small dots everywhere sort of. I've never seen it do that, and I use the same test strips all the time.

Coolant is maybe 2 years old, changed the additive filter 8 months ago or so. Maybe I should just change to chevron delo ELC(million miles!).

But I'm still wondering what caused that.... oil?

 

I don't know Allan. But i do that "flash and fill" every two years anyway!

 

I would re-do with some new test strips to eliminate the possibility that the strips are weird first.

Then I would start showing them to people whose opinions I repected & asking them if they had ever seen anything like it before.

If you're getting oil in your coolant, you should have some signs of coolant in your oil, maybe try an oil analysis to rule that out?

Does anybody offer a send in type coolant analysis that might offer more info?

Or just drive it til it pukes.

 

I use Blackstone labs for my oil, they may do coolant also

Blackstone Laboratories