{"id":422,"date":"2026-06-11T07:49:31","date_gmt":"2026-06-11T11:49:31","guid":{"rendered":"https:\/\/www.worldsbestdieseloil.com\/oil-guide\/1983-buick-century-4-3l-6-cyl-diesel-maintenance-guide\/"},"modified":"2026-06-11T07:49:31","modified_gmt":"2026-06-11T11:49:31","slug":"1983-buick-century-4-3l-6-cyl-diesel-maintenance-guide","status":"publish","type":"post","link":"https:\/\/www.worldsbestdieseloil.com\/oil-guide\/1983-buick-century-4-3l-6-cyl-diesel-maintenance-guide\/","title":{"rendered":"1983 Buick Century 4.3L Diesel Maintenance Guide: Oil, Filters & Fluids"},"content":{"rendered":"
\n
\n
\"AMSOIL
AMSOIL diesel oil guide for trucks, vans, SUVs and diesel engines<\/figcaption><\/figure>\n

For the 1983 Buick Century with the 4.3L 6-cylinder Engine Code [T] Diesel, the oil capacity is 5.9 quarts (including filter replacement). Recommended viscosities include 10W-30 for temperatures below 16\u00b0C, 15W-40 for -18 to 16\u00b0C, and 30 weight oil for continuous driving above 0\u00b0C. AMSOIL recommends using Signature Series 10W-30 Max-Duty Diesel Oil<\/a> (DTTQT-EA<\/a>) paired with an AMSOIL Oil Filter<\/a> (EAO23-EA<\/a>) for optimal protection.<\/p>\n

What oil does a 1983 Buick Century 4.3L 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 above 0\u00b0C.<\/p>\n

AMSOIL product recommendations<\/h2>\n

The following AMSOIL products are recommended for the 1983 Buick Century 4.3L Diesel to maintain engine health and performance.<\/p>\n

Engine Oil Options<\/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 10W-30 Heavy-Duty Diesel Oil<\/td>\n10W-30<\/a><\/td>\nADNQT-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<\/table>\n<\/div>\n

Oil Filter Options<\/h3>\n
\n\n\n\n\n\n
Product Name<\/th>\nCode<\/th>\n<\/tr>\n
AMSOIL Oil Filter<\/td>\nEAO23-EA<\/a><\/td>\n<\/tr>\n
WIX XP Oil Filter<\/td>\n51036XP-EA<\/a><\/td>\n<\/tr>\n
WIX Oil Filter<\/td>\n51036-EA<\/a><\/td>\n<\/tr>\n<\/table>\n<\/div>\n

Coolant & Transmission Fluids<\/h3>\n
\n\n\n\n\n\n\n
Component<\/th>\nProduct Name<\/th>\nCode<\/th>\n<\/tr>\n
Coolant<\/td>\nAMSOIL Passenger Car & Light Truck Antifreeze<\/td>\nANTPC1G-EA<\/a><\/td>\n<\/tr>\n
Coolant<\/td>\nAMSOIL Propylene Glycol Antifreeze<\/td>\nANT1G-EA<\/a><\/td>\n<\/tr>\n
ATF<\/td>\nAMSOIL Signature Series Fuel-Efficient ATF<\/td>\nATLPK-EA<\/a><\/td>\n<\/tr>\n
ATF<\/td>\nAMSOIL 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 (Continuous Driving)<\/td>\n30<\/td>\n<\/tr>\n<\/table>\n<\/div>\n

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

The total capacity for the 4.3L Diesel engine is 5.9 quarts when replacing the oil filter. It is essential to check the oil level after refilling to ensure accuracy.<\/p>\n

Oil Capacity & Torque Specs<\/h3>\n
\n\n\n\n\n
Metric<\/th>\nValue<\/th>\n<\/tr>\n
Capacity (with filter)<\/td>\n5.9 quarts<\/td>\n<\/tr>\n
Oil Drain Plug Torque<\/td>\n26 ft\/lbs<\/td>\n<\/tr>\n<\/table>\n<\/div>\n

Automatic Transmission Fluid Details<\/h2>\n

For the automatic transmission, the AMSOIL lookup note references THM125C and AF6 specifications. Note that a manufacturer Technical Service Bulletin has updated this specification from Dexron II or III to Dexron VI.<\/p>\n

Transmission Capacity<\/h3>\n
\n\n\n\n\n
Configuration<\/th>\nCapacity<\/th>\n<\/tr>\n
3-speed THM125C (Total Fill)<\/td>\n7 quarts<\/td>\n<\/tr>\n
Initial Fill<\/td>\n4 quarts<\/td>\n<\/tr>\n<\/table>\n<\/div>\n

Coolant Specifications<\/h2>\n

The cooling system has a capacity of 13.7 quarts. AMSOIL offers both pre-mix and concentrated options to meet the thermal management needs of this diesel engine.<\/p>\n

Coolant Options<\/h3>\n
\n\n\n\n\n
Product<\/th>\nFormulation Note<\/th>\n<\/tr>\n
AMSOIL Passenger Car & Light Truck Antifreeze<\/td>\nEthylene glycol 50\/50 pre-mix<\/td>\n<\/tr>\n
AMSOIL Propylene Glycol Antifreeze<\/td>\nConcentrated \u2013 requires mixing with distilled or high-quality water<\/td>\n<\/tr>\n<\/table>\n<\/div>\n

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

Maintaining a 1980s diesel engine requires specialized attention to the compression-ignition design. Owners should focus on:<\/p>\n