{"id":730,"date":"2026-07-02T16:31:24","date_gmt":"2026-07-02T20:31:24","guid":{"rendered":"https:\/\/www.worldsbestdieseloil.com\/oil-guide\/1980-cadillac-deville-5-7l-8-cyl-diesel-maintenance-guide\/"},"modified":"2026-07-02T16:31:24","modified_gmt":"2026-07-02T20:31:24","slug":"1980-cadillac-deville-5-7l-8-cyl-diesel-maintenance-guide","status":"publish","type":"post","link":"https:\/\/www.worldsbestdieseloil.com\/oil-guide\/1980-cadillac-deville-5-7l-8-cyl-diesel-maintenance-guide\/","title":{"rendered":"1980 Cadillac DeVille 5.7L Diesel Maintenance Guide: Oil & Fluid Specs"},"content":{"rendered":"
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\"AMSOIL
AMSOIL diesel oil guide for trucks, vans, SUVs and diesel engines<\/figcaption><\/figure>\n

For the 1980 Cadillac DeVille with the 5.7L 8-cylinder Engine (Code N) Diesel, the oil capacity is 7 quarts<\/strong> (including filter replacement). Recommended viscosities include 10W-30<\/strong> for temperatures below 16\u00b0C, 15W-40<\/strong> for -18\u00b0C to 16\u00b0C, and 30<\/strong> weight for continuous driving above 0\u00b0C. AMSOIL recommends using Signature Series 10W-30 Max-Duty Diesel Oil<\/a> and the EAO64-EA Oil Filter<\/a>.<\/p>\n

What oil does a 1980 Cadillac DeVille 5.7L Diesel take?<\/h2>\n

The engine requires an oil with a CF grade specification. Depending on your operating environment, you should select the appropriate viscosity to ensure proper lubrication and protection.<\/p>\n

AMSOIL product recommendations<\/h2>\n

The following AMSOIL products are specifically listed for your 1980 Cadillac DeVille 5.7L Diesel to support engine longevity and performance.<\/p>\n

Engine Oil Options<\/h3>\n
\n\n\n\n\n\n
Product Name<\/th>\nCode<\/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
AMSOIL Signature Series 5W-30 100% Synthetic Max-Duty Diesel Oil<\/td>\nDHDQT-EA<\/a><\/td>\n<\/tr>\n<\/table>\n<\/div>\n

Oil Filter Recommendation<\/h3>\n
\n\n\n\n
Product Name<\/th>\nCode<\/th>\n<\/tr>\n
AMSOIL Oil Filter<\/td>\nEAO64-EA<\/a><\/td>\n<\/tr>\n<\/table>\n<\/div>\n

Coolant & Antifreeze<\/h3>\n
\n\n\n\n\n
Product Name<\/th>\nCode<\/th>\n<\/tr>\n
AMSOIL Passenger Car & Light Truck Antifreeze & Coolant<\/td>\nANTPC1G-EA<\/a><\/td>\n<\/tr>\n
AMSOIL Propylene Glycol Antifreeze and Engine Coolant<\/td>\nANT1G-EA<\/a><\/td>\n<\/tr>\n<\/table>\n<\/div>\n

Automatic Transmission Fluid<\/h3>\n
\n\n\n\n\n
Product Name<\/th>\nCode<\/th>\n<\/tr>\n
AMSOIL Signature Series Fuel-Efficient 100% Synthetic ATF<\/td>\nATLPK-EA<\/a><\/td>\n<\/tr>\n
AMSOIL OE Fuel-Efficient 100% Synthetic ATF<\/td>\nOTLQT-EA<\/a><\/td>\n<\/tr>\n<\/table>\n<\/div>\n

Engine Oil Specifications<\/h3>\n
\n\n\n\n
Specification<\/th>\nStatus<\/th>\n<\/tr>\n
Oil Grade<\/td>\nCF<\/td>\n<\/tr>\n<\/table>\n<\/div>\n

Engine Oil Viscosity Guide<\/h3>\n
\n\n\n\n\n\n
Temperature Range<\/th>\nRecommended Viscosity<\/th>\n<\/tr>\n
Below 16\u00b0C<\/td>\n10W-30<\/td>\n<\/tr>\n
-18\u00b0C to 16\u00b0C<\/td>\n15W-40<\/td>\n<\/tr>\n
Above 0\u00b0C (Continuous Driving)<\/td>\n30<\/td>\n<\/tr>\n<\/table>\n<\/div>\n

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

For the 5.7L 8-cylinder diesel engine, the total capacity is 7 quarts<\/strong> when performing an oil change that includes a new filter. Always check the oil level after refilling to ensure accuracy.<\/p>\n

Oil Drain Plug Torque<\/h3>\n
\n\n\n\n
Component<\/th>\nTorque Value<\/th>\n<\/tr>\n
Oil Drain Plug<\/td>\n30 ft\/lbs<\/td>\n<\/tr>\n<\/table>\n<\/div>\n

Automatic Transmission Fluid Specifications<\/h2>\n

The 1980 Cadillac DeVille uses various transmission models. Note that manufacturer technical service bulletins have updated the specification from Dexron II or III to Dexron VI<\/strong> for these applications.<\/p>\n

Transmission Capacity & Models<\/h3>\n
\n\n\n\n\n\n\n
Transmission Model<\/th>\nTotal Fill Capacity<\/th>\nInitial Fill<\/th>\n<\/tr>\n
THM350<\/td>\n10 quarts<\/td>\n3.2 quarts<\/td>\n<\/tr>\n
THM250C<\/td>\n10.8 quarts<\/td>\n4.2 quarts<\/td>\n<\/tr>\n
THM400<\/td>\n11 quarts<\/td>\n3.2 quarts<\/td>\n<\/tr>\n
THM200<\/td>\n12 quarts<\/td>\n3.2 quarts<\/td>\n<\/tr>\n<\/table>\n<\/div>\n

Coolant Specifications<\/h2>\n

The cooling system requires a capacity of 23.8 quarts<\/strong>. Proper coolant maintenance is vital for protecting all cooling system metals, gaskets, and hoses.<\/p>\n

Coolant Options<\/h3>\n