Keeping a 2008 Ford F350 Pickup running smoothly requires attention to detail, especially when it is equipped with the massive 6.8L 10-cylinder engine. This powerplant is a workhorse designed for heavy towing and hauling, and it demands lubricants that can handle extreme heat and high loads without breaking down. Using the correct fluid specifications is not just about following a maintenance schedule; it is about ensuring that critical internal components are protected from wear, preventing sludge buildup, and maximizing the lifespan of the vehicle. Proper lubrication directly impacts fuel efficiency, towing capability, and overall reliability on the road.
Recommended AMSOIL Products
For the 2008 Ford F350 Pickup, selecting the right viscosity and fluid type is paramount due to the 6.8L 10-cylinder engine’s specific requirements. The engine calls for a 5W-20 viscosity grade, with a total capacity of 7.0 quarts when the filter is included. Below are the premier synthetic options and essential filters designed to meet or exceed the rigorous standards of this Ford vehicle.
- AMSOIL Signature Series 5W-20 100% Synthetic Motor Oil – The ultimate choice for severe service, offering up to 25,000 miles of protection and superior resistance to horsepower loss and wear.
- AMSOIL Extended-Life 5W-20 100% Synthetic Motor Oil – Provides 37% more cleaning power to keep the engine running smoother for up to 20,000 miles between changes.
- AMSOIL OE 5W-20 100% Synthetic Motor Oil – A cost-effective synthetic option that fights sludge and deposits while outperforming conventional oils at the mileage intervals.
- AMSOIL 5W-20 100% Synthetic High-Mileage Motor Oil – Specifically formulated for engines with over 75,000 miles, featuring enhanced anti-wear additives to reduce sludge and improve performance.
- AMSOIL Oil Filter – Features 99% efficiency at 20 microns and greater capacity for contaminants, reducing engine wear and extending service life.
- WIX XP Oil Filter – A premium aftermarket option with media that offers improvements over OEM-branded filters for reliable filtration.
- WIX Oil Filter – Another premium aftermarket option with media that offers improvements over OEM-branded filters for reliable filtration.
- WIX Air Filter – Premium media offers improvements over original equipment manufacturer (OEM)-branded filters for improved airflow.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – An ethylene glycol 50/50 pre-mix providing protection for 150,000 miles or 5 years, compatible with all cooling system metals and hoses.
- AMSOIL Propylene Glycol Antifreeze and Engine Coolant – A concentrated formula that exceeds corrosion standards and offers extended service intervals for both passenger cars and heavy-duty applications.
- AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – Designed to withstand heavy towing and elevated temperatures while maintaining fluidity in sub-zero conditions.
- AMSOIL OE Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – Offers reliable protection against wear for the 5-speed automatic transmission.
- AMSOIL Signature Series Multi-Vehicle 100% Synthetic Automatic Transmission Fluid – A versatile solution for those seeking a high-performance fluid that resists shear and protects against sludge.
- AMSOIL OE Multi-Vehicle 100% Synthetic Automatic Transmission Fluid – Promotes smooth, shudder-free shifts and guards against leaks with excellent cold-weather performance.
- WIX Transmission Filter – Ensures clean fluid flows to the transmission to prevent wear and extend the life of the gear sets.
- AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid – Provides excellent ABS responsiveness and stable viscosity over a wide temperature range for safe stopping power.
- AMSOIL SEVERE GEAR® 80W-90 100% Synthetic Gear Lube – Ideal for standard front differentials, controlling thermal runaway and protecting against rust and corrosion.
- AMSOIL SEVERE GEAR® 75W-90 100% Synthetic Gear Lube – A versatile gear lube with friction modifiers for limited-slip applications and long equipment life.
- AMSOIL SEVERE GEAR® 75W-110 100% Synthetic Gear Lube – Suitable for specific rear differential requirements, offering advanced protection against wear.
- AMSOIL SEVERE GEAR® 75W-140 100% Synthetic Gear Lube – Recommended for rear differentials with limited slip units, ensuring smooth operation and component longevity.
The engine oil selection for the 6.8L Triton V10 is critical. Whether you choose the Signature Series for maximum protection or the OE line for budget-conscious maintenance, the key is to use a 5W-20 100% synthetic fluid. The oil capacity for this engine is 7.0 quarts when the filter is changed. When refilling, it is important to remove the dipstick to allow for adequate venting and to let the oil flow freely into the crankcase before checking the level. The drain plug torque should be set to 10 ft-lbs. Using high-quality filtration is equally important; the AMSOIL Oil Filter offers extended service life and superior filtration efficiency compared to many competitors.
Transmission and Drivetrain Care
The 2008 F350 Pickup typically comes with the 5R110W automatic transmission, which requires specific attention regarding fluid types. Ford specifications have evolved, and for models from 2003 through 2008, the TorqShift transmission should be serviced with Mercon LV automatic transmission fluid. It is acceptable to mix Mercon LV with Mercon SP, but the fluid should be Mercon LV when adding or replacing transmission fluid. The total fill capacity for the 5-speed automatic is 19 quarts, while an initial fill requires 7.5 quarts. To maintain peak performance, especially when towing heavy loads or driving in challenging terrain, AMSOIL offers synthetic transmission fluids that remain fluid in extreme temperatures. For manual transmissions, such as the S6-650, a specific fill capacity of 11.6 pints is required.
The drivetrain also includes differential and transfer case lubricants. The transfer case requires a specific fill of 4 pints and should use a fluid compatible with Mercon LV specifications. For the front differential, which is a standard GL-5 type, the capacity is 5.9 pints. Various rear differentials are available depending on the axle ratio; for instance, a rear standard differential with a 10.25 ring gear requires 7 pints, while a Dana M80 unit requires 8.5 pints. Limited-slip differentials with 10.50 ring gears also require 7 pints. In these applications, using a synthetic gear lube like AMSOIL SEVERE GEAR ensures that friction modifiers are present to prevent chattering and that the gears are protected from rust and corrosion during heavy use.
Cooling System and Fluid Maintenance
Proper cooling system maintenance is vital for the longevity of the 6.8L engine, particularly given the high heat generated during operation. The cooling system capacity for the 2008 F350 is substantial, at 27.5 quarts. Whether you choose the ready-to-use Antifreeze & Coolant for Passenger Car & Light Truck or the concentrated Propylene Glycol version, the formula is designed to protect all cooling system metals, gaskets, and hoses. These coolants are phosphate-, nitrate-, and silicate-free, ensuring compatibility with all existing coolant colors and preventing sludge buildup that can lead to overheating. Maintaining the correct coolant mixture is essential for preventing boiling over in summer and freezing in winter.
Brakes and Additional Fluids
Braking performance relies heavily on the integrity of the brake fluid. The recommended fluid for this vehicle is Motorcraft High Performance DOT 3 brake fluid, P/N PM-1-C, or an equivalent meeting Ford specification WSS-M6C65-A1. AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid is an excellent upgrade, providing stable viscosity and excellent ABS responsiveness. Additionally, the power steering fluid for this vehicle is often compatible with Mercon V Automatic Transmission Fluid. Using a high-quality synthetic ATF ensures smooth operation of the power steering system and protects the pump and rack from wear. For seasonal storage, AMSOIL Gasoline Stabilizer can help keep fuel fresh for up to 12 months, preventing varnish and gum buildup that can clog fuel systems.
About the Vehicle
The 2008 Ford F350 Pickup represents a pivotal point in the history of Ford’s heavy-duty truck lineup. Known for its durability and sheer pulling power, this vehicle was built to handle the toughest jobs. The specific 6.8L 10-cylinder engine featured in this model is part of Ford’s renowned Triton series, a robust V10 engine that has been a staple in F-Series Super Duty trucks for decades. Unlike the V8 engines found in lighter-duty models, the 6.8L V10 provides a unique balance of torque and reliability, making it a favorite among owners who need consistent power without the immediate complexity of a turbocharger or a diesel particulate filter found on later diesel models.
Owners of the 2008 F350 often cite its “workhorse” reputation as a primary reason for ownership. The truck was designed with a focus on payload capacity and towing stability, capable of hauling massive loads and towing trailers that would challenge lesser vehicles. The Super Duty platform, introduced by Ford to differentiate its heavy-duty offerings from standard pickups, provided a reinforced frame and upgraded suspension components that set the standard for the segment. This particular generation of the F350 is often appreciated for its straightforward mechanical nature, allowing owners to perform maintenance and modifications with relative ease compared to modern, electronics-laden trucks. It remains a popular choice for contractors, farmers, and recreational enthusiasts who need a reliable partner for heavy hauling, snow plowing, or towing large boats and campers. While it may not offer the fuel economy of smaller engines, its reputation for long-term durability and its ability to start and run in extreme conditions have secured its place as a legendary vehicle in the American pickup truck market.