{"id":737,"date":"2026-07-03T04:11:29","date_gmt":"2026-07-03T08:11:29","guid":{"rendered":"https:\/\/www.worldsbestdieseloil.com\/oil-guide\/2018-ram-3500-pickup-6-7l-6-cyl-diesel-turbo-maintenance-guide\/"},"modified":"2026-07-03T04:11:29","modified_gmt":"2026-07-03T08:11:29","slug":"2018-ram-3500-pickup-6-7l-6-cyl-diesel-turbo-maintenance-guide","status":"publish","type":"post","link":"https:\/\/www.worldsbestdieseloil.com\/oil-guide\/2018-ram-3500-pickup-6-7l-6-cyl-diesel-turbo-maintenance-guide\/","title":{"rendered":"2018 Ram 3500 6.7L Diesel Oil Guide: Capacity, Viscosity & Filters"},"content":{"rendered":"
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\"AMSOIL
AMSOIL diesel oil guide for trucks, vans, SUVs and diesel engines<\/figcaption><\/figure>\n

For the 2018 Ram 3500 Pickup with the 6.7L 6-Cylinder Diesel (Engine Code L), the engine oil capacity is 12 quarts<\/strong> (including filter replacement). The recommended viscosity is 15W-40<\/strong> for ambient temperatures above -18\u00b0C, and 5W-40<\/strong> synthetic oil is required for temperatures below -18\u00b0C to prevent severe engine damage. AMSOIL recommends using high-quality synthetic diesel oils like Signature Series 5W-40 Max-Duty Diesel Oil<\/a>.<\/p>\n

What oil does a 2018 Ram 3500 6.7L Diesel take?<\/h2>\n

The 2018 Ram 3500 with the 6.7L diesel engine requires an API CJ\/CK-4 oil that meets specification standards MS-10902. Additionally, oil meeting Cummins CES 20081 standards may also be used. A low ash diesel engine oil is required for this application.<\/p>\n

AMSOIL product recommendations<\/h2>\n

Based on the AMSOIL lookup for your 2018 Ram 3500, here are the recommended fluids and filtration components to maintain peak 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 5W-40 100% Synthetic Max-Duty Diesel Oil<\/td>\n5W-40<\/a><\/td>\nDEOQT-EA<\/a><\/td>\n<\/tr>\n
AMSOIL 5W-40 Heavy-Duty 100% Synthetic Diesel Oil<\/td>\n5W-40<\/a><\/td>\nADOQT-EA<\/a><\/td>\n<\/tr>\n<\/table>\n<\/div>\n

Oil Filter Options<\/h3>\n
\n\n\n\n\n\n
Product Name<\/th>\nCode<\/th>\n<\/tr>\n
AMSOIL Oil Filter<\/td>\nEAO80-EA<\/a><\/td>\n<\/tr>\n
WIX XP Oil Filter<\/td>\n57620XP-EA<\/a><\/td>\n<\/tr>\n
WIX Oil Filter<\/td>\n57620-EA<\/a><\/td>\n<\/tr>\n<\/table>\n<\/div>\n

Additional Maintenance Products<\/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>\n46930-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\n
Specification<\/th>\nDetails<\/th>\n<\/tr>\n
Oil Grade<\/td>\nSEO39 (AMSOIL lookup oil grade)<\/td>\n<\/tr>\n
Viscosity (Warm)<\/td>\n15W-40 (Above -18\u00b0C)<\/td>\n<\/tr>\n
Viscosity (Cold)<\/td>\n5W-40 (Below -18\u00b0C)<\/td>\n<\/tr>\n
Required Standard<\/td>\nAPI CJ\/CK-4 (MS-10902) or Cummins CES 20081<\/td>\n<\/tr>\n<\/table>\n<\/div>\n

Warning:<\/strong> Failure to use SAE 5W-40 synthetic engine oil in ambient temperatures below 0 F (-18 C) could result in severe engine damage.<\/p>\n

How much oil does it take with a filter change?<\/h3>\n

The total capacity for the 6.7L diesel engine is 12 quarts<\/strong> when replacing the filter. When performing an oil change, follow these steps:<\/p>\n