{"id":286,"date":"2026-05-27T01:48:29","date_gmt":"2026-05-27T05:48:29","guid":{"rendered":"https:\/\/www.worldsbestdieseloil.com\/oil-guide\/2008-gmc-sierra-2500-hd-pickup-6-6l-8-cyl-diesel-turbo-maintenance-guide\/"},"modified":"2026-05-27T01:48:29","modified_gmt":"2026-05-27T05:48:29","slug":"2008-gmc-sierra-2500-hd-pickup-6-6l-8-cyl-diesel-turbo-maintenance-guide","status":"publish","type":"post","link":"https:\/\/www.worldsbestdieseloil.com\/oil-guide\/2008-gmc-sierra-2500-hd-pickup-6-6l-8-cyl-diesel-turbo-maintenance-guide\/","title":{"rendered":"2008 GMC Sierra 2500 HD 6.6L Duramax Diesel Oil & Filter Guide"},"content":{"rendered":"
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\"AMSOIL
AMSOIL diesel oil guide for trucks, vans, SUVs and diesel engines<\/figcaption><\/figure>\n

For the 2008 GMC Sierra 2500 HD Pickup with the 6.6L 8-cylinder LMM 1 Diesel Turbo engine, the oil capacity is 10.0 quarts<\/strong> (including filter). 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 Max-Duty Synthetic Diesel Oil 15W-40<\/a> paired with an AMSOIL Oil Filter<\/a>.<\/p>\n

What oil does a 2008 GMC Sierra 2500 HD LMM take?<\/h2>\n

Your vehicle requires an engine oil with a CJ-4 specification. For standard operating temperatures above -18\u00b0C, SAE 15W-40 is the preferred viscosity. If you operate in environments where ambient temperatures frequently drop below 0\u00b0F (-18\u00b0C), AMSOIL recommends using 5W-40 to facilitate improved cold starting performance.<\/p>\n

AMSOIL product recommendations<\/h2>\n

Based on the AMSOIL lookup for your 2008 GMC Sierra 2500 HD, here are the recommended fluids and filters to maintain your Duramax diesel engine.<\/p>\n

Engine Oil Options<\/h3>\n
\n\n\n\n\n
Product Name<\/th>\nViscosity<\/th>\nPart Code<\/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

Note: The AMSOIL lookup oil grade for these applications is CJ-4.<\/em><\/p>\n

Oil Filter Options<\/h3>\n
\n\n\n\n\n\n
Product Name<\/th>\nPart Code<\/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
Component<\/th>\nProduct Name<\/th>\nPart Code<\/th>\n<\/tr>\n
Air Filter<\/td>\nAMSOIL PowerCore\u00ae Filter<\/td>\nP610875-EA<\/a><\/td>\n<\/tr>\n
Coolant<\/td>\nAMSOIL Passenger Car & Light Truck Antifreeze<\/td>\nANTPC1G-EA<\/a><\/td>\n<\/tr>\n<\/table>\n<\/div>\n

Engine Oil Specifications & Details<\/h3>\n
\n\n\n\n\n\n
Specification<\/th>\nValue<\/th>\n<\/tr>\n
Oil Viscosity (Preferred)<\/td>\n15W-40<\/td>\n<\/tr>\n
Oil Viscosity (Cold Start)<\/td>\n5W-40<\/td>\n<\/tr>\n
Oil Specification<\/td>\nCJ-4<\/td>\n<\/tr>\n<\/table>\n<\/div>\n

Oil Capacity & Torque Specs<\/h3>\n
\n\n\n\n\n
Metric<\/th>\nValue<\/th>\n<\/tr>\n
Total Oil Capacity<\/td>\n10.0 Quarts (with filter)<\/td>\n<\/tr>\n
Oil Drain Plug Torque<\/td>\n13 mm Hex – 18 ft\/lbs OR 16 mm Hex – 62 ft\/lbs<\/td>\n<\/tr>\n<\/table>\n<\/div>\n

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

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

Maintaining a Duramax diesel engine requires attention to several critical systems to ensure longevity and performance:<\/p>\n