{"id":221,"date":"2026-05-22T11:19:30","date_gmt":"2026-05-22T15:19:30","guid":{"rendered":"https:\/\/www.worldsbestdieseloil.com\/oil-guide\/2015-gmc-sierra-2500-hd-pickup-6-6l-8-cyl-diesel-turbo-maintenance-guide\/"},"modified":"2026-05-22T11:19:30","modified_gmt":"2026-05-22T15:19:30","slug":"2015-gmc-sierra-2500-hd-pickup-6-6l-8-cyl-diesel-turbo-maintenance-guide","status":"publish","type":"post","link":"https:\/\/www.worldsbestdieseloil.com\/oil-guide\/2015-gmc-sierra-2500-hd-pickup-6-6l-8-cyl-diesel-turbo-maintenance-guide\/","title":{"rendered":"2015 GMC Sierra 2500 HD 6.6L LML Diesel: Oil Capacity & Maintenance Guide"},"content":{"rendered":"
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AMSOIL diesel oil guide for trucks, vans, SUVs and diesel engines<\/figcaption><\/figure>\n

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For the 2015 GMC Sierra 2500 HD Pickup with the 6.6L 8-cylinder LML Diesel Turbo engine, the oil capacity is 10.0 quarts<\/strong> (including filter replacement). The preferred viscosity for temperatures above -18\u00b0C is SAE 15W-40<\/strong>, though 5W-40 is recommended for ambient temperatures below 0\u00b0F (-18\u00b0C) to improve cold starting. AMSOIL recommends using Signature Series 15W-40 Max-Duty Synthetic Diesel Oil<\/strong> paired with an AMSOIL Oil Filter (EAO52-EA<\/a>)<\/strong> for optimal protection.<\/p>\n

What oil does a 2015 GMC Sierra 2500 HD LML Diesel take?<\/h2>\n

The 2015 GMC Sierra 2500 HD with the 6.6L LML engine requires diesel-specific engine oil meeting the CJ-4 specification. For most operating temperatures (above -18\u00b0C), an SAE 15W-40 viscosity is preferred. If you operate in extremely cold climates where ambient temperatures drop below 0\u00b0F (-18\u00b0C), using a 5W-40 viscosity is recommended to improve engine cold starting performance.<\/p>\n

AMSOIL product recommendations<\/h2>\n

The following AMSOIL products are specifically listed for the 2015 GMC Sierra 2500 HD with the 6.6L LML Diesel engine to assist with routine maintenance and heavy-duty performance.<\/p>\n

Engine Oil Options<\/h3>\n
\n\n\n\n\n
Product Name<\/th>\nViscosity<\/th>\nPart Number<\/th>\n<\/tr>\n
AMSOIL Signature Series Max-Duty Diesel Oil<\/td>\n15W-40<\/a><\/td>\nDMEQT-EA<\/a><\/td>\n<\/tr>\n
AMSOIL Heavy-Duty 100% Synthetic Diesel Oil<\/td>\n15W-40<\/a><\/td>\nADPQT-EA<\/a><\/td>\n<\/tr>\n<\/table>\n<\/div>\n

Oil Specification:<\/strong> CJ-4<\/p>\n

Oil Filter Options<\/h3>\n
\n\n\n\n\n\n
Product Name<\/th>\nPart Number<\/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

Other Maintenance Fluids & Filters<\/h3>\n
\n\n\n\n\n\n\n
Component<\/th>\nProduct Name<\/th>\nPart Number<\/th>\n<\/tr>\n
Air Filter<\/td>\nWIX Air Filter<\/td>\n49314-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
Transmission Fluid<\/td>\nAMSOIL Signature Series Fuel-Efficient 100% Synthetic ATF<\/td>\nATLPK-EA<\/a><\/td>\n<\/tr>\n<\/table>\n<\/div>\n

Engine Oil Specifications<\/h3>\n
\n\n\n\n\n\n
Attribute<\/th>\nSpecification\/Value<\/th>\n<\/tr>\n
Oil Viscosity (Preferred)<\/td>\nSAE 15W-40 (Above -18\u00b0C)<\/td>\n<\/tr>\n
Oil Viscosity (Cold Start)<\/td>\n5W-40 (Below -18\u00b0C)<\/td>\n<\/tr>\n
Oil Specification<\/td>\nCJ-4<\/td>\n<\/tr>\n<\/table>\n<\/div>\n

Engine Oil Capacity<\/h3>\n
\n\n\n\n
Description<\/th>\nCapacity<\/th>\n<\/tr>\n
Total Capacity (with filter)<\/td>\n10.0 Quarts<\/td>\n<\/tr>\n<\/table>\n<\/div>\n

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

Oil Drain Plug Torque<\/h3>\n
\n\n\n\n
Component<\/th>\nTorque Value<\/th>\n<\/tr>\n
Oil Drain Plug<\/td>\n18 ft\/lbs<\/td>\n<\/tr>\n<\/table>\n<\/div>\n

How much oil does it take with a filter change?<\/h2>\n

A complete oil service for the 6.6L LML diesel engine requires 10.0 quarts of oil, which accounts for the volume held within the new oil filter. It is critical to verify the oil level on the dipstick after the refill to ensure the engine is properly lubricated before operation.<\/p>\n

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

Maintaining a Duramax diesel engine requires attention to specific high-pressure and high-heat components. Based on common heavy-duty requirements, owners should focus on:<\/p>\n