Is The Ford F350 A Diesel – Identifying Engine Types And Performance
The Ford F-350 Super Duty is available with both high-output diesel and heavy-duty gasoline engines, depending on the specific model and year. While the 6.7L Power Stroke diesel is the most famous option for maximum towing, Ford also offers massive V8 gas engines like the 7.3L “Godzilla” for different work requirements.
If you are looking at a Super Duty on a lot or in your neighbor’s driveway, you might wonder: is the ford f350 a diesel? While many of these heavy-duty trucks are indeed equipped with diesel powerplants, it is not a universal rule. Understanding the differences between these engines is crucial for maintenance, fuel choice, and knowing exactly what your truck can handle.
In this guide, we will break down how to identify the engine in an F-350, the pros and cons of each fuel type, and which setup is best for your specific needs. Whether you are a weekend warrior towing a fifth-wheel or a DIY mechanic looking to perform your own oil changes, getting the engine facts straight is the first step.
How to Identify if Your F-350 Has a Diesel Engine
The easiest way to tell if a truck is a diesel is to look for the Power Stroke badging on the doors or front fenders. Ford is proud of its diesel heritage, and they rarely miss an opportunity to label these high-torque machines clearly. If you see a badge that says “6.7L Power Stroke B20,” you are definitely looking at a diesel.
Another foolproof method is to check the VIN (Vehicle Identification Number) located on the driver-side dashboard or door jamb. The eighth character of the VIN indicates the engine code. For newer models, a “T” or “M” often signifies a diesel variant, though you should always cross-reference the specific year’s code with a VIN decoder.
If you are standing at the gas station, the most immediate clue is the fuel filler neck. Diesel F-350s will have a dedicated diesel fuel cap (often green) and, in models made after 2011, a smaller blue cap nearby for Diesel Exhaust Fluid (DEF). If you only see one large cap and no DEF port, you are likely looking at a gasoline model.
Understanding the Powertrain: is the ford f350 a diesel?
When people ask is the ford f350 a diesel, they are usually thinking of the legendary 6.7L Power Stroke V8. This engine is the crown jewel of the Super Duty lineup, designed for those who need to move massive loads across long distances. However, Ford also caters to a massive market of users who prefer the simplicity of gasoline.
The diesel engine option typically adds a significant premium to the truck’s price tag, often around $9,000 to $12,000. This investment buys you incredible low-end torque, which is the force that gets a heavy trailer moving from a dead stop. Modern Power Stroke engines can produce over 1,000 lb-ft of torque, a figure that gas engines struggle to match.
On the flip side, the F-350 also offers the 7.3L “Godzilla” V8 and the 6.8L V8 gas engines. These are naturally aspirated powerplants, meaning they don’t use turbochargers. They are favored by fleet owners and DIYers who want a simpler engine with fewer components to fail, such as complex emissions systems or high-pressure fuel pumps.
The 6.7L Power Stroke Diesel Specs
The current 6.7L Power Stroke is a masterpiece of engineering, featuring a Compacted Graphite Iron (CGI) engine block. This material is lighter and stronger than traditional grey iron, allowing the engine to handle the immense pressures of diesel combustion. It uses a “Hot V” configuration, where the turbocharger is mounted in the center of the engine valley for better heat management.
This engine is designed for sustained work. It thrives when it is under load and reaching operating temperatures. If you plan on towing a heavy horse trailer or a large camper through mountain passes, the diesel’s exhaust brake (or “Jake brake”) provides additional safety by using engine compression to slow the truck down on descents.
The 7.3L “Godzilla” Gas V8 Specs
If you find that the answer to is the ford f350 a diesel is “no” for the truck you’re looking at, it might have the 7.3L gas engine. Known as the “Godzilla,” this engine uses an old-school overhead valve (OHV) design. This means it has a single camshaft in the block, which reduces the physical size of the engine and makes it easier to work on.
While it lacks the sheer torque of the diesel, it is no slouch. It produces 430 horsepower and 485 lb-ft of torque. For many owners, this is more than enough for occasional towing. It also avoids the complexities of Selective Catalytic Reduction (SCR) and DPF filters, which can be prone to clogging if the truck is only driven on short trips.
Maintenance Differences: Diesel vs. Gas
Owning a diesel F-350 requires a different mindset regarding maintenance compared to a gas truck. Diesel engines have larger oil capacities, often requiring 13 to 15 quarts of specialized diesel oil. This makes an oil change significantly more expensive than the 7 or 8 quarts required for a gas V8.
Fuel filtration is another critical area. A diesel F-350 has two fuel filters: one in the engine bay and one under the frame near the fuel tank. These must be changed regularly—usually every 15,000 to 22,500 miles—to protect the high-pressure fuel pump from water and contaminants. Neglecting these filters can lead to a repair bill totaling thousands of dollars.
Gas engines are much more “set it and forget it.” You have spark plugs to worry about every 100,000 miles, but you don’t have to deal with fuel-water separators or DEF fluid. For a weekend DIYer, the gas engine is much more approachable for basic garage maintenance without needing specialized diagnostic tools.
The Role of Diesel Exhaust Fluid (DEF)
If you determine the answer to is the ford f350 a diesel is “yes,” you need to get familiar with DEF. This fluid is injected into the exhaust stream to break down harmful nitrogen oxides into nitrogen and water. You will need to refill the DEF tank approximately every 5,000 miles, depending on how hard you are working the truck.
Never let your DEF tank run dry. If the truck detects an empty tank, it will enter a “limp mode,” significantly reducing your speed until the tank is refilled. It is a safety and emissions requirement that every modern diesel owner must manage. Most gas stations now have DEF pumps right next to the diesel nozzles for convenience.
Which F-350 Engine Is Right for You?
Choosing between the diesel and gas versions of the F-350 depends entirely on your use case. If you are a hot-shot hauler or someone who lives in a camper full-time, the diesel is the clear winner. The fuel efficiency while towing and the longevity of the engine (often lasting over 300,000 miles with care) justify the higher entry price.
However, if your F-350 spends most of its time as a daily driver with only occasional weekend towing, the gas engine is likely the better choice. Diesel engines do not like short trips; they need heat to keep the emissions systems clean. Frequent short drives can lead to “regeneration” issues where the DPF filter gets clogged with soot.
Off-roaders often prefer the gas engine for its lighter weight. A diesel engine can weigh 500 to 800 pounds more than a gas engine. That extra weight sits right over the front axle, which can cause the truck to sink in soft sand or mud more easily than a lighter gas-powered rig.
Common Problems to Watch Out For
Every engine has its quirks. For the diesel Power Stroke, the CP4 high-pressure fuel pump has been a point of concern for some years. If this pump fails, it can send metal shards through the entire fuel system. Many owners install a “disaster prevention kit” to ensure that if the pump fails, it doesn’t ruin the injectors.
For the gas engines, specifically the 7.3L, some early models experienced spark plug wire failures due to heat. Ford has since updated the design, but it is something to check if you notice a misfire. Overall, both engines are remarkably robust, provided you stick to a strict maintenance schedule.
Regardless of the engine, the F-350 uses the 10R140 TorqShift 10-speed automatic transmission. This unit is built to handle the torque of the diesel, so when it is paired with the gas engine, it is incredibly overbuilt and durable. Always check the transmission fluid color and smell if you are buying a used truck that has done a lot of towing.
Frequently Asked Questions About the Ford F-350 Engines
Does every Ford F-350 require DEF fluid?
No, only the diesel versions of the F-350 manufactured after 2011 require Diesel Exhaust Fluid. If your truck has a gasoline engine, you do not need to worry about DEF. You can identify a DEF-equipped truck by the small blue cap located next to the fuel filler.
How can I tell if a used F-350 is a diesel without opening the hood?
The fastest way to know is the ford f350 a diesel is to look at the badging on the side of the truck. If it has a “Power Stroke” logo, it is a diesel. Additionally, look at the tachometer on the dashboard; diesel engines have a much lower redline (usually around 4,000-4,500 RPM) compared to gas engines (6,000+ RPM).
Which engine lasts longer, the 6.7L diesel or the 7.3L gas?
Historically, diesel engines like the 6.7L Power Stroke are built to last 300,000 to 500,000 miles because they are over-engineered for high compression. However, the 7.3L gas engine is also designed for extreme longevity with a simple design. The diesel will likely last longer in high-mileage towing scenarios, while the gas engine may be more reliable for low-mileage, short-trip use.
Is the diesel F-350 better for off-roading?
While the diesel has more torque for crawling, the added weight of the diesel engine can be a disadvantage in deep mud or sand. Many off-road enthusiasts prefer the gas F-350 because it is lighter and more responsive, making it easier to manage on tight trails and soft surfaces.
Final Thoughts on the F-350 Engine Options
Determining is the ford f350 a diesel is just the beginning of your journey with this heavy-duty icon. Both the Power Stroke diesel and the V8 gas engines offer incredible capability, but they serve different masters. The diesel is a long-haul towing machine, while the gas engine is a versatile, rugged, and cost-effective workhorse.
Before you make a purchase or start a DIY repair, take the time to verify your engine type using the VIN and visual cues we discussed. Proper identification ensures you use the right fluids, buy the correct filters, and understand the limits of your machine. Treat your F-350 well, and it will serve you faithfully for decades.
Always prioritize safety when working on these trucks. Their high-pressure systems and heavy components require respect and the right tools. Whether you choose the rumble of the diesel or the roar of the gas V8, you are driving one of the most capable vehicles on the road today. Stay safe and keep hauling!
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