Mishimoto Liquid Chill OE Coolant, Yellow, Universal, Premixed 50/50, 1 Gallon

Mishimoto markets Liquid Chill Universal Yellow as compatible with all OEM coolant types and lists ASTM D3306, ASTM D6210, ASTM D4985, BS 6580, and KS K 2234 performance standards. No named OEM approval document numbers (GM DEXOS, Ford WSS-M97B44-D, VW TL 774-G, Honda HES SO-277, Toyota SLLC, BMW GS 94000) are cited on the label, the Mishimoto product page, or any publicly hosted technical data sheet as of May 2026. The inhibitor package contains sodium nitrite — appropriate for the D6210 heavy-duty diesel claim, but nitrite-containing coolant is not best practice in European OEM systems (BMW, VW/Audi, Mercedes) that specify nitrite-free Si-OAT chemistry. Owners with strict OEM coolant specifications should verify the correct specification from their owner's manual before using a universal formula.

NOAT — Nitrited Organic Acid Technology. SDS Section 3 lists sodium nitrite (CAS 7632-00-0) and sodium tolytriazole (CAS 64665-57-2) as the inhibitor ingredients alongside ethylene glycol. Sodium nitrite is the diagnostic NOAT marker — common in heavy-duty diesel coolants and consistent with the product's ASTM D6210 (heavy-duty) compliance claim. Sodium tolytriazole is a yellow-metal corrosion inhibitor that protects copper and brass cooling system components. NOAT is distinct from OAT (organic-acid only, no nitrite or silicate) and HOAT (hybrid OAT with silicate).

Ethylene glycol (EG). SDS Section 3 lists ethylene glycol at 50–<75% by weight (the lower fraction reflects the 50/50 pre-diluted formulation). The SDS does not carry an H302 'harmful if swallowed' classification at mixture level — Mishimoto's Section 11 additivity calculation places the mixture in Cat 5 (not classified as acutely toxic), which is unusual for an EG coolant and reflects an honest mixture-level calculation rather than carrying over the standalone EG ingredient classification. The product still carries a California Proposition 65 warning for ethylene glycol developmental toxicity, and the chronic-endpoint H-codes H351 (suspected carcinogen), H361fd (suspected reproductive toxin), and H373 (chronic organ toxicity) apply at mixture level.

The three chronic-endpoint codes come from the NOAT inhibitor package, not from ethylene glycol itself. Sodium nitrite is classified as a suspected carcinogen (H351) under ECHA / OSHA classification rules — the carcinogenicity concern is based on nitrosamine formation potential under prolonged exposure scenarios. Sodium tolytriazole carries a Repr. 2 (H361) classification at the ingredient level, and the combination drives the mixture-level H361fd. H373 (chronic target-organ toxicity) applies to both nitrite and tolytriazole at chronic exposure thresholds. These are Category 2 'suspected' classifications, not Category 1 'known' — but they justify the published_flag designation on the CarCareTruth product page and the warning detail in the Safety section.

No. SDS Section 13 is explicit: 'Do not empty into drains. Avoid release to the environment.' Ethylene glycol coolant — used or fresh — must be collected and brought to a recycling program. Most auto parts stores (AutoZone, O'Reilly Auto Parts, Advance Auto Parts) accept used coolant at no charge. Storm drain or ground disposal is prohibited under the Clean Water Act in most US jurisdictions, and the sweet smell of ethylene glycol attracts animals, increasing the risk of ingestion if spilled. Although SDS Section 12 states this mixture is not classified as hazardous to the aquatic environment at the mixture level, the disposal-collection requirement still applies because of the ethylene glycol base.