1991 Ford F-350 HD Pickup Oil Capacity, Types, & Filters
Your ultimate DIY maintenance guide for the 1991 Ford F-350 HD Pickup oil change is here! No more searching – find all the critical oil specs for your 1991 Ford F-350 HD Pickup, including exact engine oil capacity, the manufacturer recommended oil viscosity and type, and the correct OEM and aftermarket oil filters.
We cover all available engine options categorized by their specific engine codes, ensuring you get pinpoint accuracy for your specific vehicle configuration. Keep reading to discover everything required for a successful 1991 Ford F-350 HD Pickup oil change!
Scroll Table ➜
| Engine & Code | Oil Capacity | Oil Viscosity/Type | Oil Filter |
|---|---|---|---|
| 4.9L 6-cylinder [Y] Y | N/A | N/A | Ford FL-1-A |
| 5.8L 8-cylinder [H] H | 6 quarts (with filter) | SAE 5W-30 (All TEMPS) | Ford FL-1-A |
| 7.3L 8-cylinder [G] G | 9.8 quarts (with filter) | SAE 10W-30 (Below 32°C) SAE 15W-40 (Above -18°C) 30 (Above 0°C) | Ford FL-1-A |
| 7.5L 8-cylinder [M] M Diesel | 6 quarts (with filter) | SAE 5W-30 (All TEMPS) | Ford FL-784-A Ford E3TZ6731B |
Select Your 1991 Ford F-350 HD Pickup Engine Option
4.9L 6-cylinder Engine Code [Y] Y
Engine:
4.9L 6-cylinder [Y] Y [aka 4.9L L6 (Gas)]
Body & Trims:
Custom, XL, XLT Lariat
Oil Capacity:
N/A
Oil Viscosity/Type:
N/A
OEM Oil Filter:
Oil Filter Replaces:
E7TZ-6731-A
5.8L 8-cylinder Engine Code [H] H
Engine:
5.8L 8-cylinder [H] H [aka 5.8L V8 (Gas)]
Body & Trims:
Custom, XL, XLT Lariat
Oil Capacity:
6 quarts (with filter)
Oil Viscosity/Type:
SAE 5W-30 (All TEMPS)
OEM Oil Filter:
Oil Filter Replaces:
E7TZ-6731-A
1991 Ford F-350 HD Pickup 5.8L 8-cylinder [H] H oil change details
Oil Grade:
SEO60
Oil Capacity:
6 quarts. (with filter). Capacity is with the filter installed. When refilling, remove the dipstick to provide proper venting and allow oil to flow into the crankcase smoothly. After refilling, check the oil level and add more if needed.
Oil Viscosity/Type:
SAE 5W-30 (All TEMPS)
Name of Oil Filter:
N/A
Wix Oil Filter:
Wix Air Filter:
Coolant Capacity:
15.9 quarts - For models with an Automatic Transmission (AT) or a Manual Transmission (MT) with Air Conditioning (AC).
15.9 quarts - For models with Extra Capacity (XC).
14.8 quarts - For models WithOut Extra Capacity (XC).
14.8 quarts - For models with a Manual Transmission (MT) and WithOut Air Conditioning (AC).
Oil Drain Plug Torque:
15-25 ft/lbs (Oil Drain Plug)
Notes:
N/A
7.3L 8-cylinder Engine Code [G] G
Engine:
7.3L 8-cylinder [G] G [aka 7.3L V8 (Diesel)]
Body & Trims:
Custom, XL, XLT Lariat
Oil Capacity:
9.8 quarts (with filter)
Oil Viscosity/Type:
SAE 10W-30 (Below 32°C)
SAE 15W-40 (Above -18°C)
30 (Above 0°C)
OEM Oil Filter:
Oil Filter Replaces:
E7TZ-6731-A
1991 Ford F-350 HD Pickup 7.3L 8-cylinder [G] G oil change details
Oil Grade:
SEO84
Oil Capacity:
9.8 quarts. (with filter). Capacity is with the filter installed. When refilling, remove the dipstick to provide proper venting and allow oil to flow into the crankcase smoothly. After refilling, check the oil level and add more if needed.
Oil Viscosity/Type:
SAE 10W-30 (Below 32°C)
SAE 15W-40 (Above -18°C)
30 (Above 0°C) - 30 is preferred.
Oil Drain Plug Torque:
28 ft/lbs (Oil Drain Plug)
Notes:
(1) In 2016 when the CK-4 standard was introduced, Ford superseded the original recommendation of ESE-M2C153-E with WSS-M2C171-F1. Ford Motor Company’s position on CK-4 engine oils is the following: Ford Motor Company maintains its recommendation for motor oils meeting the specific Ford WSS-M2C171-F1 specification instead of generic CK-4 oils for its 3.2L, 6.7L, and older diesel engines (4.5L, 6.0L, 6.4L, and 7.3L). This is due to tests showing some CK-4 formulations offered less wear protection than the CJ-4 oils licensed before 2016. As a result, Ford added specific requirements to its WSS-M2C171-F1 standard for better wear protection. As a result, Ford added specific requirements to its WSS-M2C171-F1 standard for better wear protection. Following the practice of many Original Equipment Manufacturers (OEMs), Ford recommends using oils that meet its own standard, the Ford Material Engineering Specification WSS-M2C171-F1.
7.5L 8-cylinder Engine Code [M] M Diesel
Engine:
7.5L 8-cylinder [M] M Diesel [aka 7.5L V8 (Gas)]
Body & Trims:
Custom, XL, XLT Lariat
Oil Capacity:
6 quarts (with filter)
Oil Viscosity/Type:
SAE 5W-30 (All TEMPS)
OEM Oil Filter:
Oil Filter Replaces:
E3TZ-6731-A, FL-784
1991 Ford F-350 HD Pickup 7.5L 8-cylinder [M] M Diesel oil change details
Oil Grade:
SEO60
Oil Capacity:
6 quarts. (with filter). Capacity is with the filter installed. When refilling, remove the dipstick to provide proper venting and allow oil to flow into the crankcase smoothly. After refilling, check the oil level and add more if needed.
Oil Viscosity/Type:
SAE 5W-30 (All TEMPS)
Oil Drain Plug Torque:
15-25 ft/lbs (Oil Drain Plug)
Notes:
N/A
People also ask – 1991 Ford F-350 HD Pickup
What is the oil capacity of a 1991 Ford F-350 HD Pickup?
Depending on the specific engine option, the 1991 Ford F-350 HD Pickup oil capacity ranges from 6 to 9.8 quarts. Here is the exact oil capacity breakdown for each available engine configuration:
• 4.9L 6-cylinder ([Y] Y): Check Owner's Manual
• 5.8L 8-cylinder ([H] H): 6 quarts. (with filter). Capacity is with the filter installed. When refilling, remove the dipstick to provide proper venting and allow oil to flow into the crankcase smoothly. After refilling, check the oil level and add more if needed.
• 7.3L 8-cylinder ([G] G): 9.8 quarts. (with filter). Capacity is with the filter installed. When refilling, remove the dipstick to provide proper venting and allow oil to flow into the crankcase smoothly. After refilling, check the oil level and add more if needed.
• 7.5L 8-cylinder ([M] M Diesel): 6 quarts. (with filter). Capacity is with the filter installed. When refilling, remove the dipstick to provide proper venting and allow oil to flow into the crankcase smoothly. After refilling, check the oil level and add more if needed.
Always check your dipstick after refilling to ensure the proper level.
What type of oil does a 1991 Ford F-350 HD Pickup use?
Across its 4 available engine configurations, the 1991 Ford F-350 HD Pickup uses the following motor oil viscosities: SAE 5W-30 (All TEMPS) and SAE 10W-30 (Below 32°C)SAE 15W-40 (Above -18°C) 30 (Above 0°C). Using the correct manufacturer-approved oil weight is crucial for engine health. Here are the specific oil type requirements by engine:
• 4.9L 6-cylinder ([Y] Y):Grade: OEM Standard
See Cap or Owner's Manual
• 5.8L 8-cylinder ([H] H):
Grade: SEO60
SAE 5W-30 (All TEMPS)
• 7.3L 8-cylinder ([G] G):
Grade: SEO84
SAE 10W-30 (Below 32°C)
SAE 15W-40 (Above -18°C)
30 (Above 0°C) - 30 is preferred.
• 7.5L 8-cylinder ([M] M Diesel):
Grade: SEO60
SAE 5W-30 (All TEMPS)
What is the best oil filter for the 1991 Ford F-350 HD Pickup?
The proper oil filter depends on your exact engine code. The 1991 Ford F-350 HD Pickup utilizes the following premium aftermarket Wix oil filters across its lineup: 51515-EA and 51742-EA. Here is the specific OEM and aftermarket filter data for each engine:
• 4.9L 6-cylinder ([Y] Y):OEM Filter: Ford FL-1-A
Wix Filter: 51515-EA
• 5.8L 8-cylinder ([H] H):
OEM Filter: Ford FL-1-A
Wix Filter: 51515-EA
• 7.3L 8-cylinder ([G] G):
OEM Filter: Ford FL-1-A
Wix Filter: 51742-EA
• 7.5L 8-cylinder ([M] M Diesel):
OEM Filter: Ford FL-784-A or Ford E3TZ6731B
Wix Filter: 51515-EA
How often should I change the oil in my 1991 Ford F-350 HD Pickup?
For modern models running full synthetic oil, oil change intervals are typically every 7,500 to 10,000 miles. However, for older Ford F-350 HD Pickup generations (1985-2010) or those using conventional/synthetic-blend fluid, changing the oil and filter every 3,000 to 5,000 miles is highly recommended to prevent sludge buildup. Regardless of engine (4.9L 6-cylinder, 5.8L 8-cylinder, 7.3L 8-cylinder and 7.5L 8-cylinder), you should change your oil at least once a year even if you don’t reach the mileage limit.