The coolant in these engines should be replaced every couple of years. I use conventional green coolant which is getting harder to find. It seems in the US that there are only two manufacturers left for green coolant: Valvoline and Peak . And from what I can tell, Peak makes the Autozone, Advance Auto and O’Reilley in-house brands. Napa had the Valvoline coolant, but none of my local parts stores had the Peak coolant (probably because they want you to buy their in-house branded coolant).
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