Havoline Xtended Life Antifreeze/Coolant Pre-mix 50/50

The product carries GM DEX-COOL approval (GM 6277M spec), making it the correct factory-spec coolant for most GM passenger cars and light trucks originally filled with orange DEX-COOL. The TDS from chevronlubricants.com also lists Ford WSS-M97B44-D, Mercedes-Benz 325.3, and VW TL 774F compliance — a broad spec reach for domestic and European applications. Always verify against your vehicle owner's manual before switching coolant types, as the wrong inhibitor chemistry can cause corrosion.

Havoline Xtended Life meets GM 6277M, which is the same specification DEX-COOL must meet. It uses the same OAT (organic acid technology) carboxylate inhibitor chemistry as the GM factory fill — no silicates, nitrites, or phosphates. It is not manufactured by GM; it is a licensed-equivalent aftermarket alternative that meets the DEX-COOL specification.

The DANGER signal word comes from the H360D classification in SDS §2 — ethylene glycol at the 30-60% concentration in this 50/50 pre-mix carries a developmental reproductive toxicant classification (Cat 1B) under GHS. This is a standing regulatory classification for ethylene glycol at this concentration range and is not unique to Havoline; other EG-based coolants at similar concentrations carry the same or related classification. The product contains 40 mg/kg of the bittering agent to discourage ingestion, which is a higher concentration than some competitors.

No — this is the ready-to-use 50/50 pre-diluted formula. Pour it directly into the cooling system after draining the old coolant. Do not add more water, as that would reduce the freeze and boil protection below the rated range.

Ethylene glycol is a documented ingestion hazard. The H360D classification (reproductive toxicant, developmental, Cat 1B) adds a developmental concern on top of the baseline EG oral-route hazard at this concentration. This product contains 40 mg/kg of the bittering agent, which is a higher deterrent concentration than many competitors, making the fluid meaningfully unpalatable. However, the hazard classification still applies. Store out of reach of pets and children; collect spent coolant for recycling at an auto parts store rather than leaving it in drain pans or puddles.

Collect spent coolant in a sealed container — do not drain to the ground, storm sewer, or household plumbing. Ethylene glycol is harmful to animals. Most auto parts stores (AutoZone, O'Reilly, Advance Auto Parts) accept used coolant for recycling at no charge. Check your local store's policy before arrival.