{"product_id":"zerex-g40-antifreeze-coolant-concentrate-1-gal-phosphate-nitrite-free-si-oat-protection","title":"Zerex G40 Antifreeze\/Coolant Concentrate 1 Gal — Phosphate \u0026 Nitrite Free Si‑OAT Protection","description":"\u003cp\u003e\u003cstrong\u003eZerex G40 is a premium Si‑Organic Acid Technology (Si‑OAT) antifreeze\/coolant concentrate designed to protect modern engines from corrosion, freezing and boiling when mixed to the recommended ratios.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eEngine cooling systems depend on the right coolant chemistry. Zerex G40 from Valvoline is an OEM‑approved, phosphate‑ and nitrite‑free ethylene glycol concentrate formulated for cars and light trucks, especially European makes such as BMW, Mercedes‑Benz, Porsche and VW. Its long‑life carboxylate formulation resists corrosion, scale and deposits while remaining safe for aluminum and other metals commonly used in modern cooling systems.\u003c\/p\u003e\n\n\u003ch3\u003eHow does Zerex G40 protect my engine from corrosion and deposits?\u003c\/h3\u003e\n\u003cp\u003eG40 uses Si‑Organic Acid Technology that buffers and passivates metal surfaces to slow corrosion on aluminum, iron and other metals. The formula is free of nitrites, amines and phosphates, reducing the chance of harmful deposits and keeping radiator passages clear for efficient heat transfer.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eSi‑OAT chemistry targets metal protection without forming harmful sludge.\u003c\/li\u003e\n  \u003cli\u003eInhibitors guard water pumps, radiators and hoses from rust and scale.\u003c\/li\u003e\n  \u003cli\u003eBatch‑tested additives maintain long service life and system cleanliness.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat mixing ratios and temperature protection does the concentrate offer?\u003c\/h3\u003e\n\u003cp\u003eZerex G40 is a concentrate that must be mixed with clean tap or demineralized water. Different mix ratios deliver predictable freeze and boil protection so you can tailor protection to your local climate and vehicle needs.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e50\/50 mix protects from about −34°F to 265°F and is common for most climates.\u003c\/li\u003e\n  \u003cli\u003e60\/40 mix extends low‑temperature protection to roughly −62°F and higher boil resistance.\u003c\/li\u003e\n  \u003cli\u003e70\/30 mix is for extreme cold, offering protection down to approximately −84°F while maintaining high‑temperature stability.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eIs Zerex G40 compatible with my vehicle and cooling system components?\u003c\/h3\u003e\n\u003cp\u003eG40 is formulated for modern passenger cars and light trucks and is recommended by OEMs for many European brands. It is compatible with gaskets, hoses and plastics used in cooling systems and avoids common ingredients that can harm seals or paints.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eOEM‑approved for BMW, Mercedes‑Benz, Porsche and VW; suitable for older Audi and Volvo models.\u003c\/li\u003e\n  \u003cli\u003eNo imidazole, borates or nitrates, and free of nitrite, amine and phosphate chemistries.\u003c\/li\u003e\n  \u003cli\u003eSafe for rubber, plastic and metal cooling system parts when mixed and used per instructions.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat performance guarantees and safety features should I expect?\u003c\/h3\u003e\n\u003cp\u003eBesides industry‑leading freeze and boil protection, Zerex G40 comes with a long‑life warranty and includes safety additives to discourage accidental ingestion. It is both lab batch‑tested and fleet‑tested to ensure consistent performance across applications.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e5 year \/ 150,000 mile protection against engine failure from freeze‑ups or boil‑overs.\u003c\/li\u003e\n  \u003cli\u003eContains 30–50 ppm denatonium benzoate as a bittering agent to deter ingestion.\u003c\/li\u003e\n  \u003cli\u003eHigh‑quality additives protect against leaks and won’t damage gaskets or hoses.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: Zerex G40 concentrate is aimed at car and light‑truck owners, fleet managers, and technicians who need a long‑life, OEM‑approved coolant for European and mixed‑fleet vehicles. Choose G40 when you want robust aluminum protection, long service intervals, and proven freeze\/boil performance—whether topping off a radiator or completing a coolant flush.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can I mix Zerex G40 with conventional green coolant?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Mixing with other chemistries is not recommended; use G40 concentrate with water or fully flush before switching to preserve Si‑OAT protection.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: How long will a 50\/50 Zerex G40 mix last in my cooling system?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: When mixed and maintained per instructions, Zerex G40 offers up to 5 years or 150,000 miles of protection.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Zerex","offers":[{"title":"Default Title","offer_id":48083160400030,"sku":"B079WRBS36","price":52.82,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/zerex-g40-front-label.jpg?v=1785827086","url":"https:\/\/northtrailauto.ca\/products\/zerex-g40-antifreeze-coolant-concentrate-1-gal-phosphate-nitrite-free-si-oat-protection","provider":"North Trail Auto","version":"1.0","type":"link"}