I personally prefer OEM, but I was at a Lexus dealership for 9 years that used Valvoline and never seen it cause an issue
Flush your cooling system and replace the green coolant with Valvoline Zerex G48, it's what's inside BMW's coolant jugs at the dealer.
I used Valvoline Zerex Asian Blue Vehicle Antifreeze/Coolant in my 1st gen anytime I needed to drain the radiator because you can buy it anywhere. 50/50 is handy for top offs but if I was doing a full flush I got concentrated and mixed with distilled water which comes out a good bit cheaper.
Since that 5/2023 bulletin refers to Valvoline as formulating the latest version of G12Evo, and Valvoline/Zerex HT-12 says on the bottle that it is for G12Evo applications as well as referencing VW TL 774-L, it should be okay to use HT-12 in our coolant systems.
You want the very best you gotta go Honda blue.
Nothin better than that OEM Honda
I use Valvoline's Zerex Asian Blue prediluted, it works just as well.
I have looked at the additive packages on all Honda compatible coolants. Many other manufacturers (Toyota, Ford, Hyundai, Mazda, Subaru) have switched to similar coolants that are slightly worse than Honda coolant. Honda has the strictest requirements for their engines that they refused to give their engines to GM for Saturn cars after GM said they will require GM coolant. Here are my rankings:
1) Honda Type 2 (OEM) Coolant Best OEM coolant Has about the same Diethylene Glycol and anti corrosion and detergent additives
Zerex G40 is pretty good. Made by Valvoline and has G12++ spec.
I’ve never ever seen OEM Honda coolant even remotely dirty, sludged or have insufficient protection even after 100k miles.
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