ACDelco 19540938 Full Synthetic Motor Oil - dexos1 5W-30

The ACDelco 19540938 is a GM OE-approved dexos1 Full Synthetic 5W-30 Motor Oil, engineered and tested to rigorous General Motors standards. This motor oil uses high-quality full synthetic base stocks to deliver outstanding engine protection, cleanliness, and performance across a wide range of operating conditions.

ACDelco dexos1 motor oil meets the GM dexos1 specification, providing superior resistance to oxidation and thermal breakdown, excellent cold-weather pumpability, and robust protection against sludge and varnish deposit formation. It is the factory-specified motor oil for many GM gasoline engines and is commonly included in GM OE oil change kits.

Key Features:

• GM dexos1 Certified — meets the latest GM engine oil specification for gasoline-powered vehicles
• Full Synthetic Formula — high-quality synthetic base stocks provide enhanced protection over conventional oils
• Viscosity Grade: 5W-30 — suitable for a wide range of temperatures with excellent cold-start flow
• High Oxidation Resistance — helps prevent oil breakdown and extends drain intervals
• Sludge & Varnish Protection — keeps engine internals clean under normal and demanding driving conditions
• Turbocharger Protection — formulated to protect turbocharged engines from heat-related deposit buildup
• Low Speed Pre-Ignition (LSPI) Protection — helps prevent LSPI events common in modern direct-injection and turbocharged engines
• Backwards Compatible — compatible with previous dexos1 generations, ILSAC GF-6, and API SP specifications
• GM OE Quality — designed, engineered, and validated by General Motors

This oil is the current superseding part number, replacing ACDelco part numbers 19432321, 19432351, and 88865991. It is the exact oil grade and type specified by GM for many Chevrolet, GMC, Buick, and Cadillac gasoline engines.