Maintaining your 2008 Dodge RAM 1500 Pickup with the 3.7L engine requires precise fluid selection to ensure longevity and optimal performance. This vehicle places specific demands on its drivetrain and cooling systems, particularly regarding the viscosity of the lubricants used. By choosing the right synthetic blends, you can protect critical components from wear, improve fuel efficiency, and extend the service intervals between maintenance. Proper lubrication also helps manage the heat generated during daily driving or heavy towing, keeping the engine and transmission operating within safe parameters. Below, we detail the exact specifications and recommended products to keep your truck running smoothly.
Recommended AMSOIL Products
- AMSOIL Signature Series 5W-20 100% Synthetic Motor Oil – The top-tier choice for maximum engine protection, offering up to 25,000 miles of performance with superior resistance to wear and horsepower loss.
- AMSOIL Extended-Life 5W-20 100% Synthetic Motor Oil – An excellent value option providing 20,000 miles of guaranteed protection with enhanced cleaning power to keep the engine running smoother.
- AMSOIL OE 5W-20 100% Synthetic Motor Oil – Designed to outperform conventional oils, this fluid fights sludge and deposits while meeting original equipment requirements.
- AMSOIL 5W-20 100% Synthetic High-Mileage Motor Oil – Ideal for vehicles with over 75,000 miles, featuring boosted detergents and anti-wear additives to reduce sludge and improve performance.
- AMSOIL Oil Filter – Delivers 99% filtration efficiency at 20 microns, offering extended service life and greater capacity for contaminants compared to competing filters.
- WIX XP Oil Filter – A premium aftermarket filter featuring media improvements that exceed original equipment manufacturer standards for superior filtration.
- WIX Oil Filter – A standard aftermarket filter providing reliable performance and improved media over OEM-branded options.
- WIX Air Filter – A high-flow air filtration solution that protects the engine by trapping dust and debris effectively.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – A ready-to-use 50/50 formulation that protects cooling system metals and hoses for up to 150,000 miles or 5 years.
- AMSOIL Propylene Glycol Antifreeze and Engine Coolant – A concentrate that greatly surpasses standards for metallic corrosion and erosion protection in passenger cars and light trucks.
- AMSOIL Signature Series Multi-Vehicle 100% Synthetic Automatic Transmission Fluid – Withstands the rigors of heavy towing and elevated temperatures while remaining fluid in sub-zero conditions.
- AMSOIL OE Multi-Vehicle 100% Synthetic Automatic Transmission Fluid – Provides excellent cold-weather performance and guards against leaks while promoting smooth, shudder-free shifts.
- WIX Transmission Filter – Designed for specific applications to ensure proper filtration and flow within the transmission system.
- AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid – Offers excellent ABS and traction-control responsiveness with a stable viscosity over a wide temperature range.
- AMSOIL SEVERE GEAR® 75W-140 100% Synthetic Gear Lube – Provides advanced protection for differentials and limited-slip applications, controlling thermal runaway and protecting against rust.
Engine Oil Specifications and Selection
The heart of your 2008 Dodge RAM 1500 is the 3.7L V6 engine, which calls for a specific viscosity to function correctly under all temperature conditions. The recommended oil grade is 5W-20. The engine oil capacity is 5.0 quarts when the oil filter is also replaced. It is crucial to verify the oil level after refilling. When performing the oil change, ensure the oil drain plug is torqued to 25 ft/lbs to prevent leaks or damage. The AMSOIL Signature Series, Extended-Life, OE, and High-Mileage synthetic options listed above meet or exceed the required specifications, ensuring your engine is protected from the moment of startup.
Choosing the right oil depends on your driving habits and the vehicle’s mileage. If you want the absolute best protection with extended drain intervals of up to 25,000 miles, the Signature Series is the superior choice. For those seeking a balance between performance and value with a 20,000-mile interval, the Extended-Life formula is a robust solution. If you drive a vehicle with over 75,000 miles that may consume a bit more oil or show signs of wear, the High-Mileage formula contains unique chemistry to reduce sludge and improve oil pressure.
Filtration and Air Intake
An oil filter is just as critical as the oil itself, as it traps contaminants that cause internal engine wear. The AMSOIL Oil Filter is designed to allow lower restriction, keeping parts lubricated even under high pressure. It captures smaller wear-causing contaminants than many competing filters, offering extended service life that matches the extended oil change intervals of synthetic oils. Alternatively, the WIX XP Oil Filter offers premium media that provides improvements over standard OEM-branded filters, ensuring clean oil circulation.
Breathing clean air is equally important for the 3.7L engine. The WIX Air Filter utilizes premium media to trap dust and debris effectively, preventing abrasive particles from entering the combustion chamber. A clean air filter improves fuel economy and engine performance, making it a vital component of your regular maintenance routine.
Cooling System Maintenance
Proper cooling system health is essential to prevent overheating, which can lead to severe engine damage. The cooling system for this model holds a capacity of 17 quarts. AMSOIL Passenger Car & Light Truck Antifreeze & Coolant is a pre-mixed, 50/50 ethylene glycol solution that provides protection against corrosion for up to 150,000 miles or 5 years. It is free of phosphates, nitrates, and silicates, making it safe for all cooling system metals, gaskets, and hoses. For those who prefer to dilute the concentrate themselves, the AMSOIL Propylene Glycol Antifreeze and Engine Coolant is an excellent alternative that greatly surpasses standards for metallic corrosion and erosion protection.
Transmission and Drivetrain Lubrication
The transmission fluid recommendations vary slightly depending on the specific transmission code installed in your vehicle. For models equipped with the 4-speed 42RLE, the total fill capacity is 8.8 quarts, with an initial fill of 4 quarts. For the 5-speed 545RFE found in RWD models, the total fill is 16.9 quarts with an initial fill of 5.5 quarts, while the 4WD version of the 545RFE requires an initial fill of 6.6 quarts. The AMSOIL Signature Series Multi-Vehicle ATF is formulated to withstand heavy towing and challenging terrain, ensuring smooth shifts and protecting against temperature extremes. The AMSOIL OE Multi-Vehicle ATF offers similar protection at a cost-effective price point, guarding against sludge and promoting leak-free operation.
For manual transmissions, such as the GET238, the capacity is 4.6 pints. The fill and drain plugs must be torqued to 37 ft/lbs. Additionally, if your truck is equipped with limited-slip differentials, the 9.25-inch rear differential requires 4.6 pints of gear lube (or 4.4 pints with LSD), while the standard differential without LSD takes 4.6 pints as well. The Transfer Case lubricant capacities vary by model, with units like the NV241 GENII requiring 3.4 pints, the NV244 GENII also requiring 3.4 pints, and others like the NV271 and NV273 requiring 4 pints each. AMSOIL SEVERE GEAR 75W-140 is the recommended fluid for these components, containing friction modifiers specifically designed for limited-slip applications to reduce operating temperatures and extend equipment life.
Brake Fluid and Other Fluids
Maintenance of the hydraulic brake system is critical for safety. The AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid requirement for the 2008 Dodge RAM is a DOT 3 hydraulic fluid meeting MS-4574 specifications. It provides superior performance with stable viscosity, ensuring responsive braking and traction control even in extreme conditions. For power steering, the system requires ATF+4, which can be serviced using the AMSOIL Signature Series Multi-Vehicle Automatic Transmission Fluid or AMSOIL OE Multi-Vehicle Automatic Transmission Fluid mentioned earlier, ensuring compatibility and protection for the steering pump and rack.
About the Vehicle
The 2008 Dodge RAM 1500 Pickup represents a significant era in American truck manufacturing, combining rugged capability with improved ride quality compared to its predecessors. This generation of the RAM 1500, particularly those equipped with the 3.7L PowerTech V6, was designed to offer a versatile driving experience suitable for both daily commuting and light-to-medium duty work. The 3.7L engine, part of Chrysler’s PowerTech family, was known for its reliability and adequate power output for general use, providing a balance between fuel efficiency and the torque needed for hauling light loads.
Owners of the 2008 RAM 1500 often appreciate the spacious interior and the durability of the platform. As a pickup truck, it is built on a frame designed to handle the stresses of towing and payload, making it a popular choice for contractors and families alike. The 2008 model year continued the design language established in the early 2000s, featuring bold styling cues and a functional layout that prioritized driver convenience. While the 3.7L V6 is not the most powerful engine in the lineup, it is a robust choice for those who do not require the high horsepower of the larger V8 engines, offering a cost-effective and reliable powertrain for the average driver. Regular maintenance, including the use of high-quality synthetic lubricants like AMSOIL Signature Series, AMSOIL Extended-Life, and WIX filters, ensures that these trucks continue to serve their owners well for many years beyond their initial purchase date.