{"id":532,"date":"2026-06-18T22:25:30","date_gmt":"2026-06-19T02:25:30","guid":{"rendered":"https:\/\/www.worldsbestdieseloil.com\/oil-guide\/1981-oldsmobile-cutlass-5-7l-8-cyl-diesel-maintenance-guide\/"},"modified":"2026-06-18T22:25:30","modified_gmt":"2026-06-19T02:25:30","slug":"1981-oldsmobile-cutlass-5-7l-8-cyl-diesel-maintenance-guide","status":"publish","type":"post","link":"https:\/\/www.worldsbestdieseloil.com\/oil-guide\/1981-oldsmobile-cutlass-5-7l-8-cyl-diesel-maintenance-guide\/","title":{"rendered":"1981 Oldsmobile Cutlass 5.7L Diesel Maintenance Guide: Oil & Filter Specs"},"content":{"rendered":"
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\"AMSOIL
AMSOIL diesel oil guide for trucks, vans, SUVs and diesel engines<\/figcaption><\/figure>\n

For the 1981 Oldsmobile Cutlass 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 SAE 30<\/strong> is preferred for temperatures above 0\u00b0C. AMSOIL recommends using high-quality synthetic diesel oils like Signature Series 10W-30<\/a> or Signature Series 5W-30<\/a> for superior wear protection.<\/p>\n

What oil does a 1981 Oldsmobile Cutlass 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 SAE 30 for temperatures above 0\u00b0C (where SAE 30 is preferred).<\/p>\n

AMSOIL product recommendations<\/h2>\n

The following AMSOIL products are specifically listed for the 1981 Oldsmobile Cutlass 5.7L Diesel engine to assist with routine maintenance and performance optimization.<\/p>\n

Engine Oil Options<\/h3>\n
\n\n\n\n\n\n
Product Name<\/th>\nCode<\/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 Options<\/h3>\n
\n\n\n\n\n\n
Product Name<\/th>\nCode<\/th>\n<\/tr>\n
AMSOIL Oil Filter<\/td>\nEAO64-EA<\/a><\/td>\n<\/tr>\n
WIX XP Oil Filter<\/td>\n51522XP-EA<\/a><\/td>\n<\/tr>\n
WIX Oil Filter<\/td>\n51522-EA<\/a><\/td>\n<\/tr>\n<\/table>\n<\/div>\n

Coolant & Transmission Fluids<\/h3>\n
\n\n\n\n\n\n
Product Name<\/th>\nCode<\/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
AMSOIL Signature Series Fuel-Efficient 100% Synthetic ATF<\/td>\nATLPK-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
SAE 30<\/td>\nAbove 0\u00b0C (Preferred)<\/td>\n<\/tr>\n<\/table>\n<\/div>\n

Oil Grade:<\/strong> CF<\/p>\n

How much oil does it take with a filter change?<\/h3>\n

The total capacity for the 5.7L Diesel engine is 7 quarts when replacing the oil filter. It is essential to check the oil level after refilling to ensure accuracy.<\/p>\n

Oil Drain Plug Torque Specification<\/h3>\n

When performing an oil change, the oil drain plug should be tightened to 30 ft\/lbs<\/strong>.<\/p>\n

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