{"id":570,"date":"2026-06-21T18:17:38","date_gmt":"2026-06-21T22:17:38","guid":{"rendered":"https:\/\/www.worldsbestdieseloil.com\/oil-guide\/2008-chevrolet-express-2500-6-6l-8-cyl-diesel-turbo-maintenance-guide\/"},"modified":"2026-06-21T18:17:38","modified_gmt":"2026-06-21T22:17:38","slug":"2008-chevrolet-express-2500-6-6l-8-cyl-diesel-turbo-maintenance-guide","status":"publish","type":"post","link":"https:\/\/www.worldsbestdieseloil.com\/oil-guide\/2008-chevrolet-express-2500-6-6l-8-cyl-diesel-turbo-maintenance-guide\/","title":{"rendered":"2008 Chevrolet Express 2500 6.6L LMM Diesel 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 2008 Chevrolet Express 2500 equipped with the 6.6L 8-cylinder LMM 1 Diesel Turbo engine, the oil capacity is 10 quarts (with filter). The preferred viscosity for temperatures above -18\u00b0C is SAE 15W-40, though 5W-40 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<\/a> (DMEQT-EA<\/a>) paired with an AMSOIL Oil Filter<\/a> (EAO52-EA<\/a>).<\/p>\n

What oil does a 2008 Chevrolet Express 2500 6.6L LMM take?<\/h2>\n

The 2008 Chevrolet Express 2500 with the 6.6L LMM diesel engine requires an oil grade of CJ-4. For standard operating temperatures above -18\u00b0C (0\u00b0F), SAE 15W-40 is preferred. However, if you are operating in ambient temperatures below 0\u00b0F (-18\u00b0C), the AMSOIL lookup recommends using 5W-40 to improve cold starting performance.<\/p>\n

AMSOIL product recommendations<\/h2>\n

Based on the AMSOIL lookup for the 2008 Chevrolet Express 2500 with the 6.6L LMM Diesel engine, the following products are recommended to maintain peak performance and protect heavy-duty components.<\/p>\n

Engine Oil Recommendations<\/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 Heavy-Duty 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 Recommendations<\/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

Coolant & Transmission Fluid<\/h3>\n
\n\n\n\n\n\n\n\n
Component<\/th>\nProduct Name<\/th>\nCode<\/th>\n<\/tr>\n
Coolant<\/td>\nAMSOIL Passenger Car & Light Truck Antifreeze<\/td>\nANTPC1G-EA<\/a><\/td>\n<\/tr>\n
Coolant<\/td>\nAMSOIL Propylene Glycol Antifreeze<\/td>\nANT1G-EA<\/a><\/td>\n<\/tr>\n
ATF (4L80-E)<\/td>\nAMSOIL Signature Series Fuel-Efficient ATF<\/td>\nATLPK-EA<\/a><\/td>\n<\/tr>\n
ATF (4L80-E)<\/td>\nAMSOIL OE Fuel-Efficient ATF<\/td>\nOTLQT-EA<\/a><\/td>\n<\/tr>\n
ATF (4L60-E)<\/td>\nAMSOIL Signature Series Fuel-Efficient ATF<\/td>\nATLPK-EA<\/a><\/td>\n<\/tr>\n<\/table>\n<\/div>\n

Engine Oil Specifications & Capacity<\/h3>\n
\n\n\n\n\n\n\n
Detail<\/th>\nSpecification\/Value<\/th>\n<\/tr>\n
Oil Viscosity (Warm)<\/td>\n15W-40 (Preferred above -18\u00b0C)<\/td>\n<\/tr>\n
Oil Viscosity (Cold)<\/td>\n5W-40 (For temperatures below -18\u00b0C)<\/td>\n<\/tr>\n
Oil Capacity<\/td>\n10 quarts (with filter replacement)<\/td>\n<\/tr>\n
Oil Drain Plug Torque<\/td>\n62 ft\/lbs<\/td>\n<\/tr>\n<\/table>\n<\/div>\n

Note: After refilling, always check the oil level to ensure accuracy.<\/em><\/p>\n

How much coolant and transmission fluid is required?<\/h2>\n

Coolant capacity varies depending on whether your vehicle is equipped with an auxiliary heater. For the 4L80-E automatic transmission, a total fill of 13.5 quarts is required, while the 4L60-E requires a total fill of 11.2 quarts.<\/p>\n

Coolant Capacity<\/h3>\n
\n\n\n\n\n
Configuration<\/th>\nCapacity<\/th>\n<\/tr>\n
With AUX Heater<\/td>\n22.5 quarts<\/td>\n<\/tr>\n
Without AUX Heater<\/td>\n21 quarts<\/td>\n<\/tr>\n<\/table>\n<\/div>\n

Transmission Fluid Capacity<\/h3>\n
\n\n\n\n\n
Transmission Model<\/th>\nTotal Fill Capacity<\/th>\nInitial Fill<\/th>\n<\/tr>\n
4L80-E<\/td>\n13.5 quarts<\/td>\n7.7 quarts<\/td>\n<\/tr>\n
4L60-E<\/td>\n11.2 quarts<\/td>\n5 quarts<\/td>\n<\/tr>\n<\/table>\n<\/div>\n

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

Maintaining a Duramax diesel engine requires attention to specific heavy-duty components. Owners should prioritize the following:<\/p>\n