7.3 Powerstroke Oil Capacity
The 7.3L Power Stroke takes 15 quarts of oil (about 14.2 liters) when you change the oil and the filter. This is the figure listed for trucks from 1994.5 to 2003.
The final level is set by the dipstick, not by the number on the label. After the engine has run and the oil has settled, the oil level should sit between the marks on the dipstick.
Own a different Power Stroke? See our 6.0L Powerstroke oil capacity and 6.7L Powerstroke oil capacity guides.
Why Oil Matters More on the 7.3
The 7.3 uses HEUI injectors (Hydraulic Electronic Unit Injection). A high-pressure oil pump (HPOP) pressurizes engine oil and sends it to the injectors, and that oil pressure is what drives fuel injection.
Because of this, the oil does more than protect bearings. The wrong oil, or old oil, affects the injection system as well as the engine.
Oil Type and Viscosity
Use Oil That Meets WSS-M2C171-F1
Ford does not recommend API CK-4 oil in any of its diesel engines, new or old. Ford's position statement says some CK-4 formulations showed inadequate wear protection in Ford testing. Ford recommends oil that meets its own specification, WSS-M2C171-F1, which includes the CK-4 requirements plus additional Ford requirements.
What this means when you shop:
- Look for WSS-M2C171-F1 on the label. Motorcraft Super Duty Diesel 15W-40 is Ford's own oil for this engine.
- Do not buy an oil only because it says CK-4 or CJ-4 on the API donut. If it does not also meet WSS-M2C171-F1, do not use it.
- If the label does not say, ask the oil maker whether the oil carries Ford's WSS-M2C171-F1 approval.
15W-40 or 5W-40
Ford's current Motorcraft chart for its diesel engines gives these temperature ranges:
- 15W-40 (WSS-M2C171-F1): above 20 degrees F (-7 degrees C)
- 5W-40 or 0W-40 (WSS-M2C171-F1): above -20 degrees F (-29 degrees C)
The chart says to check your owner's guide for the right viscosity for your ambient temperature and how you use the truck. Older 7.3 owner's guides list their own temperature ranges, so use the guide for your model year.
Oil Filter: Motorcraft FL-1995
The Motorcraft FL-1995 (current version FL-1995-A) is the oil filter listed for the 7.3L Power Stroke from 1994 to 2003. Match the part number to your VIN with a Ford parts counter or your dealer before you buy. Some filters sold as "FL1995" are not made by Motorcraft.
7.3 Powerstroke Oil Change: Basic Steps
If you are not comfortable working under the truck, have a shop do it. Use jack stands or ramps rated for your truck, and let the engine cool before you touch the drain plug or exhaust.
What you need
- Drain pan large enough for more than 15 quarts
- 15 quarts of oil that meets WSS-M2C171-F1
- Motorcraft FL-1995-A filter
- Torque wrench, funnel, rags, and gloves
Steps
- Park on level ground and set the parking brake.
- Warm the engine briefly, shut it off, and be careful of hot oil.
- Place the drain pan under the oil pan and remove the drain plug.
- Let the oil drain fully.
- Reinstall the drain plug and tighten it to the torque listed in your service information.
- Remove the old filter and clean the mounting surface.
- Coat the new filter's rubber gasket with a thin film of fresh oil.
- Install the new filter and tighten it as shown on the filter or its box.
- Fill the engine with fresh oil, about 15 quarts total.
- Start the engine, check for leaks, shut it off, and wait a few minutes.
- Check the dipstick and adjust the level. If you overfill, drain the extra oil until the level is correct.
Dispose of used oil and filters at a recycling center or auto parts store that accepts them.
How Often to Change the Oil
Ford's scheduled maintenance guide for the 7.3L diesel lists:
- Normal use: every 5,000 miles
- Severe use: every 3,000 miles
Ford counts these as severe use: towing or heavy loads, dusty conditions, extended idling, snowplowing, off-road use, and frequent short trips under 10 miles.
If your truck works hard, use the 3,000 mile interval.
Other Fluids to Check
Check your owner's guide for the type and capacity of each fluid on your specific truck. A few points:
- Coolant: Check the coolant type, capacity, and whether your coolant needs a supplemental additive in the owner's guide for your model year.
- Transmission: The 7.3 was sold with different automatic transmissions (E4OD and 4R100, depending on year). Look up the fluid type and capacity for yours.
- Power steering: Motorcraft lists MERCON V for power steering systems built from 1998 to 2012. Check your owner's guide for your truck.
- Differentials: The gear oil type and amount vary by axle. Check the owner's guide.
FAQs
How much oil does a 7.3 hold?
A 7.3L Power Stroke takes 15 quarts (14.2 liters) when you change the oil and the filter. Confirm the final level on the dipstick after the engine has run and the oil has settled.
Can I use CK-4 oil in a 7.3 Powerstroke?
Only if it also meets Ford WSS-M2C171-F1. Ford does not recommend CK-4 oil in its diesel engines unless it carries Ford's approval. Look for WSS-M2C171-F1 on the label.
Can I run 15W-40 in the winter?
It depends on the temperature. Ford's Motorcraft chart uses 15W-40 above 20 degrees F and lists 5W-40 or 0W-40 for colder weather. Check your owner's guide for your model year and how you use the truck.
What if I overfill the oil?
Drain the extra oil until the dipstick shows the correct level. Always check the dipstick after the oil has settled, especially after a filter change.
Is the 7.3L gas engine the same?
No. The 7.3L gas V8 in 2020 and newer Super Duty trucks is a different engine with a different oil capacity (8.0 quarts) and different oil. Do not use this guide for it.
Next Step
Not sure which parts match your truck? Send your year, engine, and VIN and we can help you confirm fitment before you order.
Comparing the 7.3 with newer Super Duty engines? See our guide to Ford diesel engines to avoid by model year. Running a 6.7L Powerstroke? Check fitment in our 6.7L Powerstroke delete kit collection before ordering. Emissions-related parts are intended only for off-road, race, or non-public-road use where permitted. Confirm federal, state, and local laws before purchase and installation.
