Fleetguard coolant test

[Greenie]

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Haven't done this test for a while... I watched a Fleetguard video on YouTube and if I understand correctly the Moly & Nitrate readings intersect in the green zone called "service" DCA additive is still required. Years ago I overdosed the coolant and maybe coincidentally the water pump started leaking immediately after where it was sealed to the block.
Help me understand... If the green zone still requires additive at what point is the coolant adequately treated?

 

[Nero]

I use these almost daily at work.
Green zone is good zone. Means coolant is "ready for service"

 

[DougBoy66]

how long would you expect the DCA to last in a coolant system.

 

[Nero]

Really depends on use. Some RV's I test are model year 2017+ and need to be flushed at 60k, which is funny because the fleetguard coolant says 'million mile coolant' on it...
Yeah right...

I suggest testing annually. More frequent if you daily.

 

[DougBoy66]

Thanks @Nero