in the '18 ACCENT ? The Honda Genuine and HYUNDA coolants are distilled / deionized and Ethylene-glycol based . The HYUNDAI also has PHOSPHATE , not sure for H.G.. The H.G. and Hyundai coolant are both non-silicate . The HONDA Genuine also states non BORATE , not aware of the Hyundai coolant . BOTH coolants are a 50/50 mix . I also think both are green . Would use the H.G. coolant to top off the resevoir to the 1/2 mark or a bit below . The ACCENT is under the LOW mark ( picture below ) , especially with the cooler temps . Here's the H.G. bottle .
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