{"id":524,"date":"2026-06-18T06:49:52","date_gmt":"2026-06-18T10:49:52","guid":{"rendered":"https:\/\/www.worldsbestdieseloil.com\/oil-guide\/1984-ford-f-350-pickup-6-9l-8-cyl-diesel-maintenance-guide\/"},"modified":"2026-06-18T06:49:52","modified_gmt":"2026-06-18T10:49:52","slug":"1984-ford-f-350-pickup-6-9l-8-cyl-diesel-maintenance-guide","status":"publish","type":"post","link":"https:\/\/www.worldsbestdieseloil.com\/oil-guide\/1984-ford-f-350-pickup-6-9l-8-cyl-diesel-maintenance-guide\/","title":{"rendered":"1984 Ford F-350 6.9L Diesel Oil & Maintenance Guide"},"content":{"rendered":"
\n
\n
\"AMSOIL
AMSOIL diesel oil guide for trucks, vans, SUVs and diesel engines<\/figcaption><\/figure>\n

What oil does a 1984 Ford F-350 6.9L Diesel take?<\/h2>\n

For the 1984 Ford F-350 with the 6.9L 8-cylinder diesel engine, the required oil viscosity depends on ambient temperatures: use 10W-30 for temperatures below 32\u00b0C, 15W-40 for above -18\u00b0C, 20W-20 for -12 to 21\u00b0C, 20W-40 for above -12\u00b0C, and 30 weight for above 0\u00b0C. The engine oil capacity is 10 quarts with a filter change. AMSOIL recommends Signature Series 15W-40<\/a> or Heavy-Duty 15W-40<\/a> synthetic diesel oils.<\/p>\n

AMSOIL product recommendations<\/h2>\n

Based on the AMSOIL lookup for the 1984 Ford F-350 6.9L Diesel, the following products are recommended for optimal engine and component protection.<\/p>\n

Engine Oil Recommendations<\/h3>\n
\n\n\n\n\n
Product Name<\/th>\nPart Code<\/th>\n<\/tr>\n
AMSOIL Signature Series 15W-40 Max-Duty Diesel Oil<\/td>\nDMEQT-EA<\/a><\/td>\n<\/tr>\n
AMSOIL 15W-40 Heavy-Duty Synthetic Diesel Oil<\/td>\nADPQT-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
WIX Oil Filter<\/td>\n51742-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\n
Product Name<\/th>\nPart Code<\/th>\n<\/tr>\n
AMSOIL Signature Series Multi-Vehicle ATF<\/td>\nATFPK-EA<\/a><\/td>\n<\/tr>\n
AMSOIL OE Multi-Vehicle ATF<\/td>\nOTFQT-EA<\/a><\/td>\n<\/tr>\n
AMSOIL Torque-Drive\u00ae 100% Synthetic ATF<\/td>\nATD1G-EA<\/a><\/td>\n<\/tr>\n<\/table>\n<\/div>\n

Other Component Recommendations<\/h3>\n