GM 1940182

GM 1940182 is an automatic transmission oil specification developed by General Motors for heavy-duty automatic gearboxes used in passenger, off‑road and commercial models of the Chevrolet, GMC and Cadillac brands. The requirements include a viscosity of 75W‑80 (SAE), GL‑4/GL‑5 class, high oxidation resistance, wear protection and retention of properties under high loads and temperatures up to 150 °C. The formula provides a stable friction coefficient required for smooth operation of synchronizers and braking elements, as well as compatibility with copper and brass transmission components, preventing corrosion. The specification does not impose restrictions regarding SAPS, DPF or catalytic systems, as it concerns only the transmission, not the engine. XENUM X‑TRAN 75W‑80 GL‑4/5 transmission oil bearing the GM 1940182 designation is ideally suited for units such as 6L80, 6L90, 8L45, 8L90 and similar, delivering long‑lasting reliability and compliance with OEM requirements.