ACDelco GM OE dexosD 0W-20 Full Synthetic Diesel Motor Oil

ACDelco GM OE dexosD 0W-20 is General Motors' own factory-fill motor oil for the 3.0L LM2 Duramax diesel, the engine available in the 2019-and-newer Sierra 1500 and Silverado 1500 T1XX trucks. It carries the GM dexosD license by definition: this is the product that sets the specification that aftermarket alternatives must meet to earn the dexosD designation.

The dexosD spec is built on API SP chemistry with additional requirements specific to light-duty diesel engines: a low-SAPS (sulfated ash, phosphorus, sulfur) additive package that protects the diesel particulate filter (DPF) and an SAE 0W-20 viscosity grade required for the LM2's fuel-economy and cold-start targets. The formulation is manufactured by Phillips 66 under contract for GM.

Drain intervals follow the vehicle's Oil Life Monitor (OLM), which GM calibrates specifically for the LM2 diesel's combustion chemistry and DPF regeneration cycles. Owners typically see OLM-suggested intervals around 7,500 miles under normal mixed driving.

Best for 3.0L LM2 Duramax owners who want the factory-specification product without question, the OEM part is the simplest way to document dexosD compliance for warranty purposes. Castrol EDGE Euro Car Turbo Diesel 0W-20 and Mobil 1 ESP X2 0W-20 offer competing dexosD-licensed alternatives with broader European OEM approval portfolios and are equally valid under the GM spec; choosing between them comes down to price per quart and availability.

Skip if you own a gasoline-engine Sierra 1500, the gas engines require dexos1, not dexosD, and these are not interchangeable.

The SDS on file is a proxy document covering the ACDelco dexos1 0W-20 (gasoline formula, manufactured by Phillips 66), a dexosD-specific SDS was not publicly available as of 2026-07-01. Both grades share Group III petroleum base chemistry and the same GHS classification status: not hazardous under OSHA HazCom 2012, no signal word, no H-codes at mixture level. The H304 aspiration hazard does not apply, 0W-20 grade kinematic viscosity at 40°C is well above the 20.5 mm²/s threshold at which the CLP viscosity exemption removes the classification.

The Prop 65 warning covers the ZDDP anti-wear additive, which contains compounds California lists as reproductive hazards. This is standard for petroleum motor oils with ZDDP-based anti-wear chemistry. Used oil should go to collection, AutoZone, O'Reilly, Advance Auto Parts, Walmart Auto, and most municipal hazardous-waste facilities accept it.