A 7.3 Powerstroke engine requires 15 quarts (3.75 gallons) of oil for a complete change.
The 7.3 Powerstroke diesel engine, found in Ford Super Duty trucks from 1994-2003, has a large oil capacity due to its 444 cubic inch displacement. When performing an oil change, you'll need approximately 3.75 gallons of diesel-grade engine oil and a new oil filter. The exact amount can vary slightly depending on whether you're replacing the oil cooler or other components.
Oil Capacity Comparison for Popular Diesel Engines
| Engine Model | Oil Capacity (Quarts) | Oil Capacity (Gallons) |
|---|---|---|
| 7.3 Powerstroke | 15 | 3.75 |
| 6.7 Powerstroke | 13 | 3.25 |
| Cummins 6.7L | 12 | 3.0 |
Recommended Oil Types for 7.3 Powerstroke
- 15W-40 conventional oil - Standard recommendation for normal climates
- 5W-40 synthetic oil - Better for extreme cold weather starting
- 10W-30 synthetic blend - Good compromise for varied temperatures
Oil Change Process Overview
- Drain old oil - Remove drain plug and allow complete drainage
- Replace filter - Install new oil filter with light coating of fresh oil on seal
- Add new oil - Pour in 13 quarts first, then check level and add remaining 2 quarts as needed
- Check level - Start engine, let run 30 seconds, then check dipstick
Always use oil meeting Ford specification WSS-M2C171-C or equivalent for your 7.3 Powerstroke engine.