{"id":269,"date":"2026-05-25T09:47:38","date_gmt":"2026-05-25T13:47:38","guid":{"rendered":"https:\/\/www.worldsbestdieseloil.com\/oil-guide\/1985-cadillac-eldorado-5-7l-8-cyl-diesel-maintenance-guide\/"},"modified":"2026-05-25T09:47:38","modified_gmt":"2026-05-25T13:47:38","slug":"1985-cadillac-eldorado-5-7l-8-cyl-diesel-maintenance-guide","status":"publish","type":"post","link":"https:\/\/www.worldsbestdieseloil.com\/oil-guide\/1985-cadillac-eldorado-5-7l-8-cyl-diesel-maintenance-guide\/","title":{"rendered":"1985 Cadillac Eldorado 5.7L Diesel Engine Oil & Maintenance Guide"},"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 1985 Cadillac Eldorado 5.7L Diesel take?<\/h2>\n

For the 1985 Cadillac Eldorado with the 5.7L 8-cylinder Engine Code [N] Diesel, the engine requires an oil viscosity of 10W-30 (for temperatures below 16\u00b0C), 15W-40 (-18 to 16\u00b0C), or 30 (above 0\u00b0C). The total oil capacity is 7.0 quarts with a filter change. AMSOIL recommends using Signature Series 10W-30 Max-Duty Diesel Oil<\/a> or Signature Series 5W-30 Max-Duty Diesel Oil<\/a> paired with an EAO64-EA<\/a> oil filter.<\/p>\n

AMSOIL product recommendations<\/h2>\n

The following AMSOIL products are recommended for your 1985 Cadillac Eldorado 5.7L Diesel to ensure optimal protection and performance.<\/p>\n

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

Coolant & Transmission Fluids<\/h3>\n
\n\n\n\n\n\n\n
Product Name<\/th>\nPart Code<\/th>\n<\/tr>\n
AMSOIL Passenger Car & Light Truck Antifreeze<\/td>\nANTPC1G-EA<\/a><\/td>\n<\/tr>\n
AMSOIL Propylene Glycol Antifreeze<\/td>\nANT1G-EA<\/a><\/td>\n<\/tr>\n
AMSOIL Signature Series Fuel-Efficient ATF<\/td>\nATLPK-EA<\/a><\/td>\n<\/tr>\n
AMSOIL OE Fuel-Efficient ATF<\/td>\nOTLQT-EA<\/a><\/td>\n<\/tr>\n<\/table>\n<\/div>\n

Other Lubricants<\/h3>\n
\n\n\n\n
Product Name<\/th>\nPart Code<\/th>\n<\/tr>\n
AMSOIL SEVERE GEAR\u00ae 80W-90 Synthetic Gear Lube<\/td>\nAGLPK-EA<\/a><\/td>\n<\/tr>\n<\/table>\n<\/div>\n

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

Proper lubrication is vital for the longevity of the 5.7L diesel engine. Always verify your specific operating temperatures before selecting a 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<\/td>\n30 (Preferred for continuous driving)<\/td>\n<\/tr>\n<\/table>\n<\/div>\n

Engine Oil Capacity & Torque<\/h3>\n
\n\n\n\n\n\n
Description<\/th>\nSpecification<\/th>\n<\/tr>\n
Oil Capacity (with filter)<\/td>\n7 quarts<\/td>\n<\/tr>\n
Oil Drain Plug Torque<\/td>\n30 ft\/lbs<\/td>\n<\/tr>\n
Oil Specification (Grade)<\/td>\nCF<\/td>\n<\/tr>\n<\/table>\n<\/div>\n

Transmission Specifications<\/h3>\n

The AMSOIL lookup note specifies the following for the automatic transmission (THM325-4L \/ AF6):<\/p>\n