{"id":607,"date":"2026-06-24T18:29:19","date_gmt":"2026-06-24T22:29:19","guid":{"rendered":"https:\/\/www.worldsbestdieseloil.com\/oil-guide\/2019-gmc-sierra-3500-pickup-6-6l-8-cyl-diesel-turbo-maintenance-guide\/"},"modified":"2026-06-24T18:29:19","modified_gmt":"2026-06-24T22:29:19","slug":"2019-gmc-sierra-3500-pickup-6-6l-8-cyl-diesel-turbo-maintenance-guide","status":"publish","type":"post","link":"https:\/\/www.worldsbestdieseloil.com\/oil-guide\/2019-gmc-sierra-3500-pickup-6-6l-8-cyl-diesel-turbo-maintenance-guide\/","title":{"rendered":"2019 GMC Sierra 3500 6.6L L5P Diesel Oil & Maintenance Guide"},"content":{"rendered":"
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\"AMSOIL
AMSOIL diesel oil guide for trucks, vans, SUVs and diesel engines<\/figcaption><\/figure>\n

For the 2019 GMC Sierra 3500 Pickup with the 6.6L 8-cylinder L5P Diesel Turbo engine, the oil capacity is 10 quarts<\/strong> (including filter replacement). The preferred viscosity for temperatures above -18\u00b0C is SAE 15W-40<\/strong>, though 5W-40<\/strong> is recommended for all temperatures when ambient conditions are below 0\u00b0F (-18\u00b0C) to improve cold starting. AMSOIL recommends using Signature Series 15W-40 Max-Duty Diesel Oil<\/strong> or 15W-40 Heavy-Duty Synthetic Diesel Oil<\/strong> paired with high-efficiency oil filters.<\/p>\n

What oil does a 2019 GMC Sierra 3500 6.6L L5P take?<\/h2>\n

The 2019 GMC Sierra 3500 with the 6.6L L5P diesel engine requires an oil meeting the CJ-4 specification. For standard operating temperatures above -18\u00b0C (0\u00b0F), SAE 15W-40 is preferred. However, if you operate in environments where ambient temperatures frequently drop below 0\u00b0F (-18\u00b0C), using a 5W-40 viscosity is recommended to improve cold starting performance.<\/p>\n

AMSOIL product recommendations<\/h2>\n

Based on the AMSOIL lookup for your 2019 GMC Sierra 3500, the following products are recommended to maintain engine health and performance.<\/p>\n

Engine Oil Options<\/h3>\n
\n\n\n\n\n
Product Name<\/th>\nViscosity<\/th>\nCode<\/th>\n<\/tr>\n
AMSOIL Signature Series Max-Duty Diesel Oil<\/td>\n15W-40<\/a><\/td>\nDMEQT-EA<\/a><\/td>\n<\/tr>\n
AMSOIL 15W-40 Heavy-Duty Synthetic Diesel Oil<\/td>\n15W-40<\/a><\/td>\nADPQT-EA<\/a><\/td>\n<\/tr>\n<\/table>\n<\/div>\n

Note: The AMSOIL lookup notes an oil grade of CJ-4.<\/em><\/p>\n

Oil Filter Options<\/h3>\n
\n\n\n\n\n\n
Product Name<\/th>\nCode<\/th>\n<\/tr>\n
AMSOIL Oil Filter<\/td>\nEAO52-EA<\/a><\/td>\n<\/tr>\n
WIX XP Oil Filter<\/td>\n57202XP-EA<\/a><\/td>\n<\/tr>\n
WIX Oil Filter<\/td>\n57202-EA<\/a><\/td>\n<\/tr>\n<\/table>\n<\/div>\n

Air & Coolant Recommendations<\/h3>\n
\n\n\n\n\n\n
Component<\/th>\nProduct Name<\/th>\nCode<\/th>\n<\/tr>\n
Air Filter<\/td>\nWIX Air Filter [1]<\/td>\nWA10695-EA<\/a><\/td>\n<\/tr>\n
Coolant<\/td>\nAMSOIL Passenger Car & Light Truck Antifreeze & Coolant<\/td>\nANTPC1G-EA<\/a><\/td>\n<\/tr>\n
Coolant<\/td>\nAMSOIL Propylene Glycol Antifreeze and Engine Coolant<\/td>\nANT1G-EA<\/a><\/td>\n<\/tr>\n<\/table>\n<\/div>\n

Engine Oil Specifications<\/h3>\n
\n\n\n\n\n\n
Specification<\/th>\nDetails<\/th>\n<\/tr>\n
Oil Grade<\/td>\nCJ-4<\/td>\n<\/tr>\n
Preferred Viscosity<\/td>\n15W-40 (Above -18\u00b0C)<\/td>\n<\/tr>\n
Cold Weather Viscosity<\/td>\n5W-40 (All Temps below -18\u00b0C)<\/td>\n<\/tr>\n<\/table>\n<\/div>\n

Oil Change Capacity and Torque<\/h3>\n
\n\n\n\n\n
Metric<\/th>\nValue<\/th>\n<\/tr>\n
Total Capacity<\/td>\n10 quarts (with filter)<\/td>\n<\/tr>\n
Oil Drain Plug Torque<\/td>\n18 ft\/lbs<\/td>\n<\/tr>\n<\/table>\n<\/div>\n

Note: Always check the oil level after refilling.<\/em><\/p>\n

Common diesel oil-related concerns and how AMSOIL products may help<\/h2>\n

Diesel engines operating under heavy loads or in extreme climates face unique lubrication challenges. The following table outlines common concerns for this engine type.<\/p>\n

\n\n\n\n\n\n
Concern<\/th>\nWhy it matters<\/th>\nAMSOIL Product<\/th>\nHow it may help<\/th>\nLimitation<\/th>\n<\/tr>\n
Cold Starting<\/td>\nThick oil can hinder lubrication during startup in freezing temps.<\/td>\n5W-40 Viscosity options<\/td>\nImproves flow at low temperatures.<\/td>\nRequires correct viscosity selection.<\/td>\n<\/tr>\n
Engine Wear<\/td>\nContaminants and friction can damage critical components.<\/td>\nDMEQT-EA<\/a><\/td>\nDelivers up to 6X more wear protection.<\/td>\nRequires regular maintenance.<\/td>\n<\/tr>\n
Contamination<\/td>\nSmall particles can cause abrasive wear.<\/td>\nEAO52-EA<\/a><\/td>\n99% efficiency at 20 microns.<\/td>\nFilter must be replaced per interval.<\/td>\n<\/tr>\n<\/table>\n<\/div>\n

Diesel maintenance notes for this vehicle<\/h2>\n

Maintaining a Duramax L5P requires attention to several key systems beyond just the engine oil:<\/p>\n