{"id":617,"date":"2026-06-25T06:20:17","date_gmt":"2026-06-25T10:20:17","guid":{"rendered":"https:\/\/www.worldsbestdieseloil.com\/oil-guide\/2021-ram-2500-pickup-6-7l-6-cyl-diesel-turbo-maintenance-guide\/"},"modified":"2026-06-25T06:20:17","modified_gmt":"2026-06-25T10:20:17","slug":"2021-ram-2500-pickup-6-7l-6-cyl-diesel-turbo-maintenance-guide","status":"publish","type":"post","link":"https:\/\/www.worldsbestdieseloil.com\/oil-guide\/2021-ram-2500-pickup-6-7l-6-cyl-diesel-turbo-maintenance-guide\/","title":{"rendered":"2021 Ram 2500 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

What oil does a 2021 Ram 2500 6.7L Diesel take?<\/h2>\n

The 2021 Ram 2500 with the 6.7L 6-cylinder diesel engine (Engine Code L) requires an oil capacity of 12 quarts<\/strong> with a filter change. The recommended viscosity is 10W-30 for temperatures above -18\u00b0C<\/strong> and 5W-40 for temperatures below -18\u00b0C<\/strong>. For optimal protection, AMSOIL recommends using high-quality synthetic diesel oils such as Signature Series Max-Duty Diesel Oil<\/a>.<\/p>\n

AMSOIL product recommendations<\/h2>\n

Based on the AMSOIL lookup for your 2021 Ram 2500, here are the recommended fluids and filters to maintain your Cummins diesel engine.<\/p>\n

Engine Oil Recommendations<\/h3>\n
\n\n\n\n\n
Product Name<\/th>\nPart Code<\/th>\n<\/tr>\n
AMSOIL Signature Series 10W-30 100% Synthetic Max-Duty Diesel Oil<\/td>\nDTTQT-EA<\/a><\/td>\n<\/tr>\n
AMSOIL 10W-30 Heavy-Duty 100% Synthetic Diesel Oil<\/td>\nADNQT-EA<\/a><\/td>\n<\/tr>\n<\/table>\n<\/div>\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>\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

Other Maintenance Products<\/h3>\n
\n\n\n\n\n
Component<\/th>\nProduct Name \/ Code<\/th>\n<\/tr>\n
Air Filter<\/td>\nWIX Air Filter (46930-EA)<\/a><\/td>\n<\/tr>\n
Coolant<\/td>\nAMSOIL Passenger Car & Light Truck Antifreeze (ANTPC1G-EA)<\/a><\/td>\n<\/tr>\n<\/table>\n<\/div>\n

Engine Oil Specifications and Details<\/h2>\n

Proper lubrication is vital for the longevity of your 6.7L Cummins diesel engine. Following the correct viscosity and specification ensures protection under heavy workloads.<\/p>\n

Oil Viscosity Guide<\/h3>\n
\n\n\n\n\n
Condition<\/th>\nViscosity<\/th>\n<\/tr>\n
Above -18\u00b0C<\/td>\n10W-30<\/td>\n<\/tr>\n
Below -18\u00b0C<\/td>\n5W-40<\/td>\n<\/tr>\n<\/table>\n<\/div>\n

Oil Capacity and Service Notes<\/h3>\n

Capacity:<\/strong> 12 quarts (with filter).<\/p>\n

Drain Plug Torque:<\/strong> 37 ft\/lbs.<\/p>\n

Service Procedure:<\/strong> After filling, start the engine and idle for several minutes. Check for leaks. Stop the engine. Wait 30 minutes to allow the oil to drain back into the pan and check the level again.<\/p>\n

Important Specification Notes:<\/strong> The AMSOIL lookup note specifies using API CJ\/CK-4 oil that meets MS-10902 standards. Oil meeting Cummins CES 20081 standards may also be used. Low ash diesel engine oil is required.<\/p>\n

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

Maintaining a heavy-duty diesel requires more than just standard oil changes. For the 2021 Ram 2500, focus on these key areas:<\/p>\n