{"id":451,"date":"2026-06-13T10:35:21","date_gmt":"2026-06-13T14:35:21","guid":{"rendered":"https:\/\/www.worldsbestdieseloil.com\/oil-guide\/1985-buick-lesabre-5-7l-8-cyl-diesel-maintenance-guide\/"},"modified":"2026-06-13T10:35:21","modified_gmt":"2026-06-13T14:35:21","slug":"1985-buick-lesabre-5-7l-8-cyl-diesel-maintenance-guide","status":"publish","type":"post","link":"https:\/\/www.worldsbestdieseloil.com\/oil-guide\/1985-buick-lesabre-5-7l-8-cyl-diesel-maintenance-guide\/","title":{"rendered":"1985 Buick LeSabre 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

What oil does a 1985 Buick LeSabre 5.7L Diesel take?<\/h2>\n

The 1985 Buick LeSabre with the 5.7L 8-cylinder Engine Code [N] diesel requires an oil grade of CF. Recommended viscosities include 10W-30 for temperatures below 16\u00b0C, 15W-40 for temperatures between -18 to 16\u00b0C, and 30 viscosity for continuous driving above 0\u00b0C. For a complete oil change, the capacity is 4.5 quarts including the filter.<\/p>\n

AMSOIL product recommendations<\/h2>\n

Based on the AMSOIL lookup for this vehicle, the following high-performance products are recommended to maintain engine health and efficiency.<\/p>\n

Engine Oil Recommendations<\/h3>\n
\n\n\n\n\n\n
Product Name<\/th>\nViscosity<\/th>\nCode<\/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 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 Recommendations<\/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 Recommendations<\/h3>\n
\n\n\n\n\n
Product Name<\/th>\nCode<\/th>\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

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

Proper lubrication is critical for the longevity of the 5.7L diesel engine. Always verify your specific operating conditions against the viscosity requirements below.<\/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 (Continuous Driving)<\/td>\n30<\/td>\n<\/tr>\n<\/table>\n<\/div>\n

Oil Capacity & Torque Specs<\/h3>\n