{"id":577,"date":"2026-06-22T09:05:23","date_gmt":"2026-06-22T13:05:23","guid":{"rendered":"https:\/\/www.worldsbestdieseloil.com\/oil-guide\/2003-ford-excursion-7-3l-8-cyl-diesel-turbo-maintenance-guide\/"},"modified":"2026-06-22T09:05:23","modified_gmt":"2026-06-22T13:05:23","slug":"2003-ford-excursion-7-3l-8-cyl-diesel-turbo-maintenance-guide","status":"publish","type":"post","link":"https:\/\/www.worldsbestdieseloil.com\/oil-guide\/2003-ford-excursion-7-3l-8-cyl-diesel-turbo-maintenance-guide\/","title":{"rendered":"2003 Ford Excursion 7.3L Diesel Oil Guide: Capacity, Viscosity & Filters"},"content":{"rendered":"
\n
\n
\"AMSOIL
AMSOIL diesel oil guide for trucks, vans, SUVs and diesel engines<\/figcaption><\/figure>\n

What oil does a 2003 Ford Excursion 7.3L Diesel take?<\/h2>\n

The 2003 Ford Excursion with the 7.3L 8-cylinder Engine Code [F] Diesel Turbo requires an oil capacity of 15 quarts (including the filter). Recommended viscosities depend on ambient temperature: 15W-40 is used for temperatures above -12\u00b0C, while 10W-30 and 0W-30 are recommended for colder climates. AMSOIL recommends using Signature Series or Heavy-Duty Synthetic Diesel Oil for optimal protection.<\/p>\n

AMSOIL product recommendations<\/h2>\n

Based on the vehicle lookup data, the following AMSOIL products are recommended for your 2003 Ford Excursion 7.3L diesel engine.<\/p>\n

Engine Oil Recommendations<\/h3>\n
\n\n\n\n\n
Product Name<\/th>\nViscosity<\/th>\nPart Number<\/th>\n<\/tr>\n
AMSOIL Signature Series Max-Duty Diesel Oil<\/td>\n15W-40<\/a><\/td>\nDMEQT-EA<\/a><\/td>\n<\/tr>\n
AMSOIL 15W-40 Heavy-Duty Synthetic Diesel Oil<\/td>\n15W-40<\/a><\/td>\nADPQT-EA<\/a><\/td>\n<\/tr>\n<\/table>\n<\/div>\n

Oil Filter Recommendations<\/h3>\n
\n\n\n\n\n\n
Product Name<\/th>\nPart Number<\/th>\n<\/tr>\n
AMSOIL Oil Filter<\/td>\nEAO99-EA<\/a><\/td>\n<\/tr>\n
WIX XP Oil Filter<\/td>\n51734XP-EA<\/a><\/td>\n<\/tr>\n
WIX Oil Filter<\/td>\n51734-EA<\/a><\/td>\n<\/tr>\n<\/table>\n<\/div>\n

Other Maintenance Products<\/h3>\n
\n\n\n\n\n
Component<\/th>\nProduct Name<\/th>\nPart Number<\/th>\n<\/tr>\n
Air Filter<\/td>\nWIX Air Filter [1]<\/td>\n46728-EA<\/a><\/td>\n<\/tr>\n
Coolant<\/td>\nAMSOIL Passenger Car & Light Truck Antifreeze & Coolant<\/td>\nANTPC1G-EA<\/a><\/td>\n<\/tr>\n<\/table>\n<\/div>\n

Engine Oil Specifications & Details<\/h2>\n

Proper lubrication is critical for the 7.3L Power Stroke engine to manage high pressures and heavy-duty workloads.<\/p>\n

Oil Viscosity Guide<\/h3>\n
\n\n\n\n\n\n\n
Temperature Range<\/th>\nRecommended Viscosity<\/th>\n<\/tr>\n
Above -12\u00b0C<\/td>\n15W-40<\/td>\n<\/tr>\n
-23\u00b0C to 32\u00b0C<\/td>\n10W-30<\/td>\n<\/tr>\n
Below -1\u00b0C<\/td>\n5W-30<\/td>\n<\/tr>\n
Below -18\u00b0C<\/td>\n0W-30<\/td>\n<\/tr>\n<\/table>\n<\/div>\n

Oil Capacity<\/h3>\n
\n\n\n\n
Description<\/th>\nCapacity<\/th>\n<\/tr>\n
Total capacity with filter change<\/td>\n15 quarts<\/td>\n<\/tr>\n<\/table>\n<\/div>\n

Note: Always check the oil level after refilling.<\/em><\/p>\n

OEM Specification Notes<\/h3>\n

The AMSOIL lookup note references Ford Material Engineering Specification WSS-M2C171-F1 for this application. The notes indicate that in 2016, Ford superseded the original recommendation of WSS-M2C171-C with WSS-M2C171-F1. Ford continues to recommend oils meeting WSS-M2C171-F1 for older diesel engines like the 7.3L, noting that some CK-4 formulations may have shown inadequate wear protection compared to earlier CJ-4 formulations.<\/p>\n

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

Maintaining a 7.3L Power Stroke requires attention to several key areas:<\/p>\n