{"id":753,"date":"2026-07-04T05:36:27","date_gmt":"2026-07-04T09:36:27","guid":{"rendered":"https:\/\/www.worldsbestdieseloil.com\/oil-guide\/1981-buick-electra-5-7l-8-cyl-diesel-maintenance-guide\/"},"modified":"2026-07-04T05:36:27","modified_gmt":"2026-07-04T09:36:27","slug":"1981-buick-electra-5-7l-8-cyl-diesel-maintenance-guide","status":"publish","type":"post","link":"https:\/\/www.worldsbestdieseloil.com\/oil-guide\/1981-buick-electra-5-7l-8-cyl-diesel-maintenance-guide\/","title":{"rendered":"1981 Buick Electra 5.7L Diesel Maintenance Guide: Oil, Filters & Fluids"},"content":{"rendered":"
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\"AMSOIL
AMSOIL diesel oil guide for trucks, vans, SUVs and diesel engines<\/figcaption><\/figure>\n

For the 1981 Buick Electra 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<\/strong> weight for continuous driving above 0\u00b0C. AMSOIL recommends using Signature Series 10W-30 Max-Duty Diesel Oil<\/a> paired with an AMSOIL Oil Filter (EAO64-EA)<\/a>.<\/p>\n

What oil does a 1981 Buick Electra 5.7L Diesel take?<\/h2>\n

The 1981 Buick Electra with the 5.7L 8-cylinder Engine Code [N] requires an oil grade of CF. The specific viscosity depends on your operating temperature: use 10W-30 for temperatures below 16\u00b0C, 15W-40 for environments between -18 to 16\u00b0C, and a 30 weight is preferred for continuous driving when temperatures are above 0\u00b0C.<\/p>\n

AMSOIL product recommendations<\/h2>\n

To ensure optimal performance for your 1981 Buick Electra diesel, AMSOIL provides high-performance synthetic options designed to meet the specific demands of older diesel engines.<\/p>\n

Engine Oil Recommendations<\/h3>\n
\n\n\n\n\n\n
Product Name<\/th>\nPart Code<\/th>\n<\/tr>\n
AMSOIL Signature Series 10W-30 Max-Duty Diesel Oil<\/td>\nDTTQT-EA<\/a><\/td>\n<\/tr>\n
AMSOIL 10W-30 Heavy-Duty Synthetic Diesel Oil<\/td>\nADNQT-EA<\/a><\/td>\n<\/tr>\n
AMSOIL Signature Series 5W-30 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>\nPart Code<\/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>\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 Recommendations<\/h3>\n
\n\n\n\n\n
Product Name<\/th>\nPart Code<\/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<\/h3>\n
\n\n\n\n
Specification<\/th>\nDetails<\/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 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

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

For the 1981 Buick Electra 5.7L Diesel, the total capacity is 7 quarts<\/strong> when replacing the oil filter. It is essential to check the oil level after refilling to ensure accuracy.<\/p>\n

Oil Change Specifications<\/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

Automatic Transmission Fluid Requirements<\/h2>\n

The transmission fluid requirements vary based on the specific model of the automatic transmission installed in your vehicle. Note that manufacturer technical service bulletins have updated these specifications from Dexron II or III to Dexron VI<\/strong>.<\/p>\n

Transmission Capacities & Specs<\/h3>\n
\n\n\n\n\n\n\n
Transmission Model<\/th>\nTotal Fill Capacity<\/th>\nInitial Fill<\/th>\n<\/tr>\n
THM350C (3-speed)<\/td>\n10 quarts<\/td>\n3 quarts<\/td>\n<\/tr>\n
THM250C (3-speed)<\/td>\n10.8 quarts<\/td>\n4 quarts<\/td>\n<\/tr>\n
THM200C (3-speed)<\/td>\n9.4 quarts<\/td>\n3.5 quarts<\/td>\n<\/tr>\n
THM200-4R (4-speed)<\/td>\n11 quarts<\/td>\n5 quarts<\/td>\n<\/tr>\n<\/table>\n<\/div>\n

Coolant System Specifications<\/h2>\n

Maintaining the cooling system is vital for diesel engine longevity. The capacity varies slightly depending on whether the vehicle is equipped with Air Conditioning (AC).<\/p>\n

\n\n\n\n\n
Configuration<\/th>\nCapacity<\/th>\n<\/tr>\n
With AC<\/td>\n18 quarts<\/td>\n<\/tr>\n
Without AC (O)<\/td>\n18.5 quarts<\/td>\n<\/tr>\n<\/table>\n<\/div>\n

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