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17 CRV EXL AWD, 14 CRV EXL AWD
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If you want to do something beneficial to the coolant then periodically replace the coolant in the overflow reservoir. Everytime you drive the car coolant is force out of the radiator into the reservoir and is sucked back in when the engine cools. This slowly refreshes the additives in the coolant in the engine.
 

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A word of caution/safety.....don't do anything to any part of the cooling system until the motor is cold.
 

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On my '88 Accord, I was given some free "water pump lubricant" from someone who worked for Casite. Of course, back then, we didn't know any better. I get a call from my then-wife saying the interior of the car had filled up with steam--the heater core had sprung a leak. I tore that thing down to the firewall and replaced it. Just as I'm filling up the radiator, that sprung a leak!! So whatever was in that Casite stuff rotted away both the heater core and the radiator.

Use only the Honda coolant, right from the dealer, and that's all you'll ever need. Additives don't help anyone but the investors of the companies that make them.
 

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2017 CRV Touring - Pearl White w Black Interior
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On my '88 Accord, I was given some free "water pump lubricant" from someone who worked for Casite. Of course, back then, we didn't know any better. I get a call from my then-wife saying the interior of the car had filled up with steam--the heater core had sprung a leak. I tore that thing down to the firewall and replaced it. Just as I'm filling up the radiator, that sprung a leak!! So whatever was in that Casite stuff rotted away both the heater core and the radiator.

Use only the Honda coolant, right from the dealer, and that's all you'll ever need. Additives don't help anyone but the investors of the companies that make them.

Sounds like the "lubricant" was actually a caustic of some sort. :eek:
 

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The Preston jug says “use in any make, any model, any color (antifreeze), any car/light duty truck”.

What part of the water pump gets lubricated?
 
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