{"id":457,"date":"2026-06-13T16:56:25","date_gmt":"2026-06-13T20:56:25","guid":{"rendered":"https:\/\/www.worldsbestdieseloil.com\/oil-guide\/1983-buick-regal-5-7l-8-cyl-diesel-maintenance-guide\/"},"modified":"2026-06-13T16:56:25","modified_gmt":"2026-06-13T20:56:25","slug":"1983-buick-regal-5-7l-8-cyl-diesel-maintenance-guide","status":"publish","type":"post","link":"https:\/\/www.worldsbestdieseloil.com\/oil-guide\/1983-buick-regal-5-7l-8-cyl-diesel-maintenance-guide\/","title":{"rendered":"1983 Buick Regal 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 1983 Buick Regal with the 5.7L 8-cylinder Diesel engine (Engine Code N), the oil capacity is 7 quarts<\/strong> (including filter change). 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 10W-30 Max-Duty Diesel Oil<\/a> and the EAO64-EA Oil Filter<\/a>.<\/p>\n

What oil does a 1983 Buick Regal 5.7L Diesel take?<\/h2>\n

The engine requires an oil with a CF specification. Depending on your operating temperature, you should select one of the following viscosities: 10W-30 for temperatures below 16\u00b0C, 15W-40 for temperatures between -18 to 16\u00b0C, or 30 weight for continuous driving above 0\u00b0C.<\/p>\n

AMSOIL product recommendations<\/h2>\n

Based on the AMSOIL lookup for your 1983 Buick Regal 5.7L Diesel, here are the recommended products to maintain engine and system 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 10W-30 Max-Duty Diesel Oil<\/td>\n10W-30<\/a><\/td>\nDTTQT-EA<\/a><\/td>\n<\/tr>\n
AMSOIL 10W-30 Heavy-Duty Synthetic Diesel Oil<\/td>\n10W-30<\/a><\/td>\nADNQT-EA<\/a><\/td>\n<\/tr>\n
AMSOIL Signature Series 5W-30 Max-Duty Diesel Oil<\/td>\n5W-30<\/a><\/td>\nDHDQT-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 & Transmission Fluids<\/h3>\n
\n\n\n\n\n\n\n
Component<\/th>\nProduct Name<\/th>\nCode<\/th>\n<\/tr>\n
Coolant<\/td>\nPassenger Car & Light Truck Antifreeze<\/td>\nANTPC1G-EA<\/a><\/td>\n<\/tr>\n
Coolant<\/td>\nPropylene Glycol Antifreeze<\/td>\nANT1G-EA<\/a><\/td>\n<\/tr>\n
ATF (THM200-4R)<\/td>\nSignature Series Fuel-Efficient ATF<\/td>\nATLPK-EA<\/a><\/td>\n<\/tr>\n
ATF (THM200-4R)<\/td>\nOE Fuel-Efficient ATF<\/td>\nOTLQT-EA<\/a><\/td>\n<\/tr>\n<\/table>\n<\/div>\n

Note: Air and Oil Vapor filter recommendations are not available from the source data.<\/em><\/p>\n

Engine Oil Specifications<\/h3>\n
\n\n\n\n\n\n\n
Parameter<\/th>\nValue<\/th>\n<\/tr>\n
Oil Viscosity Grade<\/td>\nCF<\/td>\n<\/tr>\n
10W-30 Usage<\/td>\nBelow 16\u00b0C<\/td>\n<\/tr>\n
15W-40 Usage<\/td>\n-18 to 16\u00b0C<\/td>\n<\/tr>\n
30 Weight Usage<\/td>\nAbove 0\u00b0C (Preferred for continuous driving)<\/td>\n<\/tr>\n<\/table>\n<\/div>\n

Oil Capacity and Torque Specs<\/h3>\n
\n\n\n\n\n
Specification<\/th>\nDetail<\/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<\/table>\n<\/div>\n

Maintenance Tip:<\/strong> Always check the oil level after refilling.<\/p>\n

Automatic Transmission Fluid Requirements<\/h2>\n

The fluid requirements for your Buick Regal depend on which transmission is installed. Note that manufacturer technical service bulletins have updated the specification from Dexron II or III to Dexron VI for these applications.<\/p>\n

THM200-4R (4 Speed)<\/h3>\n
\n\n\n\n\n
Type<\/th>\nCapacity<\/th>\n<\/tr>\n
Total Fill<\/td>\n11 quarts<\/td>\n<\/tr>\n
Initial Fill<\/td>\n5 quarts<\/td>\n<\/tr>\n<\/table>\n<\/div>\n

THM350C (3 Speed)<\/h3>\n
\n\n\n\n\n
Type<\/th>\nCapacity<\/th>\n<\/tr>\n
Total Fill<\/td>\n10.8 quarts<\/td>\n<\/tr>\n
Initial Fill<\/td>\n4 quarts<\/td>\n<\/tr>\n<\/table>\n<\/div>\n

THM200C (3 Speed)<\/h3>\n
\n\n\n\n\n
Type<\/th>\nCapacity<\/th>\n<\/tr>\n
Total Fill<\/td>\n9.4 quarts<\/td>\n<\/tr>\n
Initial Fill<\/td>\n3.5 quarts<\/td>\n<\/tr>\n<\/table>\n<\/div>\n

Common diesel oil-related concerns and how AMSOIL products may help<\/h2>\n

Diesel engines face unique stresses that require specialized lubrication. The following table outlines common concerns for this engine type.<\/p>\n

\n\n\n\n\n\n
Concern<\/th>\nWhy it matters<\/th>\nAMSOIL Product<\/th>\nHow it may help<\/th>\nLimitation<\/th>\n<\/tr>\n
Engine Wear<\/td>\nDiesel combustion creates high pressure and friction.<\/td>\nDTTQT-EA<\/a><\/td>\nDelivers up to 6X more wear protection.<\/td>\nRequires regular oil changes.<\/td>\n<\/tr>\n
Contaminants<\/td>\nSmall particles can cause abrasive wear.<\/td>\nEAO64-EA<\/a><\/td>\n99% efficiency at 20 microns.<\/td>\nFilter must be replaced per interval.<\/td>\n<\/tr>\n
Extreme Temps<\/td>\nViscosity changes can affect lubrication during start-up.<\/td>\nDHDQT-EA<\/a><\/td>\nExcels in extreme temperatures.<\/td>\nNot a substitute for proper viscosity selection.<\/td>\n<\/tr>\n<\/table>\n<\/div>\n

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