{"id":903,"date":"2026-07-11T10:07:27","date_gmt":"2026-07-11T14:07:27","guid":{"rendered":"https:\/\/www.worldsbestdieseloil.com\/oil-guide\/1984-buick-lesabre-5-7l-8-cyl-diesel-maintenance-guide\/"},"modified":"2026-07-11T10:07:27","modified_gmt":"2026-07-11T14:07:27","slug":"1984-buick-lesabre-5-7l-8-cyl-diesel-maintenance-guide","status":"publish","type":"post","link":"https:\/\/www.worldsbestdieseloil.com\/oil-guide\/1984-buick-lesabre-5-7l-8-cyl-diesel-maintenance-guide\/","title":{"rendered":"1984 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

For the 1984 Buick LeSabre with the 5.7L 8-cylinder Diesel engine (Engine Code N), 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 to 16\u00b0C, and 30 weight<\/strong> for continuous driving above 0\u00b0C. AMSOIL recommends using Signature Series Max-Duty Diesel Oil<\/strong> for superior wear protection.<\/p>\n

What oil does a 1984 Buick LeSabre 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: 10W-30 for temperatures below 16\u00b0C, 15W-40 for temperatures between -18 to 16\u00b0C, or a 30 weight oil for continuous driving in temperatures above 0\u00b0C.<\/p>\n

AMSOIL product recommendations<\/h2>\n

The following AMSOIL products are specifically listed for your 1984 Buick LeSabre 5.7L Diesel to ensure optimal engine and component performance.<\/p>\n

Engine Oil Options<\/h3>\n
\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
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<\/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 & Antifreeze<\/h3>\n
\n\n\n\n\n
Product Name<\/th>\nPart Code<\/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>\nPart Code<\/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\n\n
Viscosity Range<\/th>\nCondition<\/th>\n<\/tr>\n
10W-30<\/td>\nBelow 16\u00b0C<\/td>\n<\/tr>\n
15W-40<\/td>\n-18 to 16\u00b0C<\/td>\n<\/tr>\n
30<\/td>\nAbove 0\u00b0C (Preferred for continuous driving)<\/td>\n<\/tr>\n<\/table>\n<\/div>\n

Oil Grade:<\/strong> CF<\/p>\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: Always check the oil level after refilling.<\/em><\/p>\n

Automatic Transmission Fluid Specifications<\/h2>\n

For automatic transmissions, the manufacturer’s technical service bulletin has updated the specification from Dexron II or III to Dexron VI<\/strong>. The AMSOIL lookup lists several options based on your specific transmission model.<\/p>\n

Transmission Capacities<\/h3>\n
\n\n\n\n\n\n\n
Transmission Model<\/th>\nTotal Fill Capacity<\/th>\nInitial Fill<\/th>\n<\/tr>\n
THM250C (3-speed)<\/td>\n10.8 quarts<\/td>\n4 quarts<\/td>\n<\/tr>\n
THM200-4R (4-speed)<\/td>\n11 quarts<\/td>\n5 quarts<\/td>\n<\/tr>\n
THM325-4L (4-speed)<\/td>\n10 quarts<\/td>\n3.2 quarts<\/td>\n<\/tr>\n
THM200C (3-speed)<\/td>\n9.4 quarts<\/td>\n3.5 quarts<\/td>\n<\/tr>\n<\/table>\n<\/div>\n

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

Maintaining a vintage diesel engine requires attention to thermal management and filtration. Based on the provided data, owners should focus on:<\/p>\n