{"id":102,"date":"2026-05-18T19:43:59","date_gmt":"2026-05-18T23:43:59","guid":{"rendered":"https:\/\/www.worldsbestdieseloil.com\/oil-guide\/?p=102"},"modified":"2026-05-31T18:42:51","modified_gmt":"2026-05-31T22:42:51","slug":"1983-oldsmobile-98-5-7l-diesel-maintenance-guide","status":"publish","type":"post","link":"https:\/\/www.worldsbestdieseloil.com\/oil-guide\/1983-oldsmobile-98-5-7l-diesel-maintenance-guide\/","title":{"rendered":"1983 Oldsmobile 98 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 1983 Oldsmobile 98 equipped with the 5.7L 8-cylinder Engine Code [N] Diesel, the engine 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 SAE 30<\/strong> is preferred for temperatures above 0\u00b0C. AMSOIL recommends using their Signature Series or Heavy-Duty synthetic diesel oils for optimal protection.<\/p>\n

What oil does a 1983 Oldsmobile 98 5.7L Diesel take?<\/h2>\n

The engine requires an oil with a CF 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 SAE 30 (preferred) for temperatures above 0\u00b0C. Always check your oil level after a refill.<\/p>\n

AMSOIL product recommendations<\/h2>\n

To ensure your Oldsmobile 98 Diesel receives premium protection, AMSOIL provides several high-performance options for engine lubrication, filtration, and cooling systems.<\/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 10W-30 100% Synthetic Max-Duty Diesel Oil<\/td>\n10W-30<\/a><\/td>\nDTTQT-EA<\/a><\/td>\n<\/tr>\n
AMSOIL 10W-30 Heavy-Duty 100% Synthetic Diesel Oil<\/td>\n10W-30<\/a><\/td>\nADNQT-EA<\/a><\/td>\n<\/tr>\n
AMSOIL Signature Series 5W-30 100% Synthetic 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 Recommendations<\/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 & Coolant<\/td>\nANTPC1G-EA<\/a><\/td>\n<\/tr>\n
Coolant<\/td>\nAMSOIL Propylene Glycol Antifreeze and Engine Coolant<\/td>\nANT1G-EA<\/a><\/td>\n<\/tr>\n
ATF<\/td>\nAMSOIL Signature Series Fuel-Efficient 100% Synthetic ATF<\/td>\nATLPK-EA<\/a><\/td>\n<\/tr>\n
ATF<\/td>\nAMSOIL 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
Specification<\/th>\nDetail<\/th>\n<\/tr>\n
Oil Grade<\/td>\nCF<\/td>\n<\/tr>\n
Drain Plug Torque<\/td>\n30 ft\/lbs<\/td>\n<\/tr>\n<\/table>\n<\/div>\n

Engine Oil Capacity<\/h3>\n
\n\n\n\n
Condition<\/th>\nCapacity<\/th>\n<\/tr>\n
With Filter Change<\/td>\n7 quarts<\/td>\n<\/tr>\n<\/table>\n<\/div>\n

How much transmission fluid does it take?<\/h2>\n

The capacity varies depending on which automatic transmission is installed in your vehicle. For the THM350C, the total fill is 10 quarts with a 3-quart initial fill. The THM325-4L requires a 10-quart total fill and 3.2-quart initial fill. The THM250C requires a 10.8-quart total fill and 4-quart initial fill. The THM200-4R requires an 11-quart total fill and 5-quart initial fill.<\/p>\n

Note: The AMSOIL lookup notes that for these applications, the specification has been updated from Dexron II or III to Dexron VI per a manufacturer Technical Service Bulletin.<\/em><\/p>\n

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