The 2021 Ram ProMaster 1500 equipped with the 3.6L V6 (Engine Code [G] ERB 2 Flex) is a versatile commercial vehicle known for its reliability and fuel efficiency. However, keeping this engine and its transmission running at peak performance requires more than just following the standard factory maintenance schedule. The 3.6L Pentastar engine, while robust, benefits significantly from the superior thermal stability and protection offered by 100% synthetic lubricants. By utilizing high-performance fluids, owners can minimize wear, reduce sludge formation, and ensure smoother shifting, which is particularly important for those who frequently haul heavy loads or operate in extreme temperatures.
Recommended AMSOIL Products
- AMSOIL Signature Series 5W-20 100% Synthetic Motor Oil – The top-tier choice for maximum engine protection, offering superior resistance to horsepower loss and wear compared to conventional oils. It provides guaranteed protection for up to 25,000 miles or one year.
- AMSOIL Extended-Life 5W-20 100% Synthetic Motor Oil – An excellent option that delivers 37% more cleaning power to help keep the engine running smoother for longer, with guaranteed protection for up to 20,000 miles.
- AMSOIL OE 5W-20 100% Synthetic Motor Oil – A cost-effective 100% synthetic alternative that fights sludge and deposits while providing protection comparable to the original equipment manufacturer’s specifications.
- AMSOIL 5W-20 100% Synthetic High-Mileage Motor Oil – Specifically formulated for vehicles with over 75,000 miles, featuring a boosted detergent package to reduce sludge and prevent oil consumption.
- AMSOIL Oil Filter – Designed to provide 99% filtering efficiency at 20 microns, allowing lower restriction for better lubrication of critical engine parts and reducing wear on the 3.6L engine.
- WIX Oil Filter – A premium media option that offers improvements over standard OEM-branded filters, providing a reliable and high-quality filtration solution for oil changes.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – A phosphate-, nitrate-, and silicate-free ethylene glycol 50/50 pre-mix that protects cooling system metals, gaskets, and hoses for up to 150,000 miles.
- AMSOIL Propylene Glycol Antifreeze and Engine Coolant – A concentrated, less toxic alternative that offers protection up to 150,000 miles in passenger cars and light trucks, greatly surpassing corrosion standards.
- AMSOIL Signature Series Multi-Vehicle 100% Synthetic Automatic Transmission Fluid – Withstands heavy towing and elevated temperatures, remaining fluid in sub-zero conditions to protect the 62TE automatic transmission from sludge and wear.
- AMSOIL OE Multi-Vehicle 100% Synthetic Automatic Transmission Fluid – An affordable synthetic option that resists sludge, guards against leaks, and promotes smooth, shudder-free shifts for the transmission.
- AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid – Provides excellent ABS and traction-control responsiveness with stable viscosity over a wide temperature range, ensuring safe and reliable braking performance.
- AMSOIL 100% Synthetic Multi-Vehicle Power Steering Fluid – Reduces friction and helps seals remain soft to prevent leaks, while offering strong anti-wear protection and low-temperature performance for quiet operation.
The engine oil capacity for the 3.6L V6, including the filter, is 5.9 quarts. When topping off or changing the fluid, it is critical to adhere to this specification. After the refill, always check the oil level to ensure proper lubrication. The drain plug torque specification is 20 ft/lbs, a detail that should not be overlooked during service to prevent leaks or stripped threads. For owners utilizing E85 or M85 fuels, note that the extended drain intervals associated with AMSOIL may require oil analysis to confirm their validity, as the fuel composition can impact fluid longevity.
Beyond the engine, the cooling system for the 2021 ProMaster 1500 requires approximately 10.6 quarts of AMSOIL Passenger Car & Light Truck Antifreeze & Coolant. Whether you choose the pre-mixed version or the concentrated Propylene Glycol Antifreeze and Engine Coolant, proper cooling is essential for maintaining engine efficiency and preventing overheating. The transmission fluid capacity for a total fill of the 6-speed 62TE automatic transmission is 9 quarts, with an initial fill capacity of 5.5 quarts. Maintaining the correct fluid level here is vital for the longevity of the transmission, especially under the load conditions typical of a work van.
Essential Additives and Maintenance Products
While engine and transmission fluids form the backbone of vehicle maintenance, other components benefit equally from AMSOIL technology. The AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid system, requiring MOPAR DOT 4 compatibility, is a key safety feature. Switching to a 100% synthetic brake fluid ensures consistent pedal feel and responsiveness, even in wet or extreme temperature conditions where conventional fluids might boil or absorb moisture. Similarly, the power steering system, designated for PS006 fluid, benefits from the friction reduction and leak prevention properties of the 100% synthetic multi-vehicle Power Steering Fluid.
For owners concerned about fuel economy and injector health, the AMSOIL P.i.® Performance Improver Gasoline Additive is a powerful tool. It can restore up to 14% horsepower and rejuvenate GDI fuel injectors to 100% flow rate after a single tank of treated fuel. This is particularly beneficial for direct injection engines prone to carbon buildup. Additionally, the Upper Cylinder Lubricant Corrosion Inhibitor helps protect fuel system components and upper cylinders from corrosion and wear, further extending the life of the internal engine components.
Seasonal maintenance also plays a crucial role in vehicle longevity. During long periods of storage, AMSOIL Gasoline Stabilizer can keep fuel fresh for up to 12 months, preventing varnish and gum buildup that can clog fuel lines. For engines that sit idle, Engine Fogging Oil offers a highly effective rust preventive for internal components, ideal for protecting the engine during the winter months or when the vehicle is not in use.
About the Vehicle
The 2021 Ram ProMaster 1500 represents the third generation of the ProMaster series, a vehicle line that has redefined the light commercial van segment in North America. Built on a platform derived from the Fiat Ducato, the ProMaster features a front-engine, front-wheel-drive layout that offers a surprisingly car-like driving experience. This unique architecture provides a lower floor height compared to traditional rear-engine or rear-wheel-drive vans, which significantly reduces the physical strain of loading and unloading goods throughout the workday. The 3.6L Pentastar V6 engine is the heart of this workhorse, delivering a robust power range that is well-suited for the demanding needs of tradespeople, delivery services, and utility fleets.
Owners of the ProMaster 1500 value its blend of maneuverability and payload capacity. The wheelbase options allow for various cargo volumes, but the 1500 model is particularly popular for its balance of size and fuel efficiency. The cabin is designed for comfort, often including features that make long shifts more bearable, such as ample legroom and a well-organized dashboard layout. However, the heavy duty nature of the vehicle means it often faces severe service conditions, including stop-and-go traffic, towing, and operation in extreme hot or cold climates. These conditions accelerate fluid breakdown and wear on engine components, making the switch to synthetic lubricants a highly recommended upgrade for fleet managers and individual owners alike.
Despite its reputation for reliability, the ProMaster 1500 is not immune to common issues associated with high-mileage commercial use. One frequent concern among owners is the development of oil sludge and carbon deposits in the engine, particularly in the Valvetronic and variable valve timing systems. High-quality synthetic oils with robust detergent packages help mitigate this issue, keeping internal passages clear and ensuring consistent performance. Another prevalent problem is premature wear on the automatic transmission, often characterized by shuddering or rough shifts. This is often due to the degradation of conventional transmission fluids under heavy loads. AMSOIL’s synthetic transmission fluids are formulated to resist thermal breakdown and protect against the formation of varnish, ensuring smooth operation for longer intervals.
Cooling system issues can also arise, with some owners reporting overheating or Propylene Glycol Antifreeze and Engine Coolant leaks over time, often due to the degradation of the factory fill antifreeze or hose deterioration. Using a high-performance antifreeze with extended service intervals can prevent these failures, maintaining consistent engine temperature even during the hottest summer days or the coldest winters. Finally, brake fade and reduced responsiveness can occur in heavy vehicles as the brake fluid absorbs moisture over time. A full flush with synthetic DOT 4 brake fluid restores hydraulic performance, ensuring that the stopping power of the van remains sharp and reliable, a critical safety factor for any vehicle carrying heavy cargo.
Maintaining your 2021 Ram ProMaster 1500 with the correct AMSOIL products is more than just a maintenance task; it is an investment in the vehicle’s longevity and efficiency. By utilizing these premium synthetic lubricants and additives, you are not only meeting the manufacturer’s requirements but exceeding them, ensuring that your ProMaster 1500 continues to perform at its best mile after mile.