{"id":266,"date":"2026-05-25T00:54:42","date_gmt":"2026-05-25T04:54:42","guid":{"rendered":"https:\/\/www.worldsbestdieseloil.com\/oil-guide\/1980-cadillac-seville-5-7l-8-cyl-diesel-maintenance-guide\/"},"modified":"2026-05-25T00:54:42","modified_gmt":"2026-05-25T04:54:42","slug":"1980-cadillac-seville-5-7l-8-cyl-diesel-maintenance-guide","status":"publish","type":"post","link":"https:\/\/www.worldsbestdieseloil.com\/oil-guide\/1980-cadillac-seville-5-7l-8-cyl-diesel-maintenance-guide\/","title":{"rendered":"1980 Cadillac Seville 5.7L Diesel Engine Oil & Maintenance Guide"},"content":{"rendered":"
\n
\n
\"AMSOIL
AMSOIL diesel oil guide for trucks, vans, SUVs and diesel engines<\/figcaption><\/figure>\n

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

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

AMSOIL product recommendations<\/h2>\n

The following AMSOIL products are recommended for your 1980 Cadillac Seville 5.7L Diesel based on the provided lookup data.<\/p>\n

Engine Oil Options<\/h3>\n
\n\n\n\n\n\n
Product Name<\/th>\nViscosity<\/th>\nPart Code<\/th>\n<\/tr>\n
Signature Series Max-Duty Synthetic Diesel Oil<\/td>\n10W-30<\/a><\/td>\nDTTQT-EA<\/a><\/td>\n<\/tr>\n
Signature Series Max-Duty Synthetic Diesel Oil<\/td>\n5W-30<\/a><\/td>\nDHDQT-EA<\/a><\/td>\n<\/tr>\n
Heavy-Duty 100% Synthetic Diesel Oil<\/td>\n10W-30<\/a><\/td>\nADNQT-EA<\/a><\/td>\n<\/tr>\n<\/table>\n<\/div>\n

Oil Specification:<\/strong> CF<\/p>\n

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

Transmission & Gear Fluids<\/h3>\n
\n\n\n\n\n\n
Product Name<\/th>\nPart Code<\/th>\n<\/tr>\n
Signature Series Fuel-Efficient Synthetic ATF<\/td>\nATLPK-EA<\/a><\/td>\n<\/tr>\n
OE Fuel-Efficient Synthetic ATF<\/td>\nOTLQT-EA<\/a><\/td>\n<\/tr>\n
SEVERE GEAR\u00ae 80W-90 Synthetic Gear Lube<\/td>\nAGLPK-EA<\/a><\/td>\n<\/tr>\n<\/table>\n<\/div>\n

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

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

Proper lubrication is critical for the high-compression 5.7L diesel engine found in this Cadillac Seville. Always verify your specific operating temperature to select the correct viscosity.<\/p>\n

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 to 16\u00b0C<\/td>\n15W-40<\/td>\n<\/tr>\n
Above 0\u00b0C (Preferred for continuous driving)<\/td>\n30<\/td>\n<\/tr>\n<\/table>\n<\/div>\n

Engine Oil Capacity & Torque<\/h3>\n
\n\n\n\n\n
Metric<\/th>\nValue<\/th>\n<\/tr>\n
Capacity (with filter)<\/td>\n7 quarts<\/td>\n<\/tr>\n
Oil Drain Plug Torque<\/td>\n30 ft\/lbs<\/td>\n<\/tr>\n<\/table>\n<\/div>\n

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

Automatic Transmission Specifications<\/h3>\n

The AMSOIL lookup note references a technical service bulletin from the manufacturer updating specifications from Dexron II or III to Dexron VI<\/strong> for this application.<\/p>\n

\n\n\n\n\n
Application<\/th>\nCapacity<\/th>\n<\/tr>\n
3 speed THM325 Total Fill<\/td>\n12 quarts<\/td>\n<\/tr>\n
Initial Fill<\/td>\n3.2 quarts<\/td>\n<\/tr>\n<\/table>\n<\/div>\n

Note: The final drive is serviced separately.<\/em><\/p>\n

Coolant Capacity Details<\/h2>\n
\n\n\n\n\n\n
Configuration<\/th>\nCapacity<\/th>\n<\/tr>\n
California<\/td>\n15.3 quarts<\/td>\n<\/tr>\n
With HD Cooling<\/td>\n18.5 quarts<\/td>\n<\/tr>\n
With O HD Cooling<\/td>\n17.4 quarts<\/td>\n<\/tr>\n<\/table>\n<\/div>\n

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

Maintaining a 1980s GM diesel engine requires attention to specific systems that differ from gasoline counterparts. Owners should prioritize the following:<\/p>\n