Keeping your 1986 Plymouth Reliant running smoothly requires more than just adding generic fluids from the local auto parts store. This classic vehicle features a specific 2.2-liter inline-four engine (Engine Code [D] D) that benefits significantly from high-quality synthetic lubricants designed to withstand modern temperature extremes while respecting the original engineering tolerances. Whether you are navigating daily commutes, weekend drives, or long-distance tours, selecting the correct oil grade and filter ensures that your engine operates at peak efficiency for years to come.
Recommended AMSOIL Products
For the 1986 Plymouth Reliant 2.2L engine, the manufacturer specifies a 5W-30 viscosity for optimal performance, with a total capacity of 4.0 quarts including the filter change. Below are the premier AMSOIL products tailored for this specific vehicle:
- AMSOIL Signature Series 5W-30 100% Synthetic Motor Oil – Offers the highest level of engine protection, delivering up to 25,000 miles of performance before an oil change is required. This oil reduces horsepower loss and wear better than conventional oils.
- AMSOIL Extended-Life 5W-30 100% Synthetic Motor Oil – An excellent choice for extended drain intervals up to 20,000 miles, providing superior cleaning power to keep the engine running smoother for a longer duration.
- AMSOIL OE 5W-30 100% Synthetic Motor Oil – This option outperforms conventional oils while mimicking original equipment performance. It fights sludge and deposits effectively, making it a great value for daily driving.
- AMSOIL 5W-30 100% Synthetic High-Mileage Motor Oil – Ideally suited for engines with over 75,000 miles, this formula features boosted detergents to reduce sludge and specialized additives that help seal gaskets to minimize leaks.
- AMSOIL Oil Filter – Provides a filtration efficiency of 99 percent at 20 microns, capturing smaller contaminants than standard filters to reduce engine wear and extend oil life.
- WIX Oil Filter – A premium aftermarket alternative that offers improvements over original equipment manufacturer branded filters, ensuring reliable flow and filtration.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – A 50/50 pre-mix formula that protects cooling system metals and hoses for up to 150,000 miles, requiring no mixing with water.
- AMSOIL Propylene Glycol Antifreeze and Engine Coolant – A concentrated option that requires mixing, offering exceptional corrosion protection and a 150,000-mile service interval for passenger cars.
- AMSOIL Signature Series Multi-Vehicle 100% Synthetic Automatic Transmission Fluid – Designed to withstand heavy towing and elevated temperatures, this fluid remains fluid in sub-zero conditions and resists shear.
- AMSOIL OE Multi-Vehicle 100% Synthetic Automatic Transmission Fluid – Promotes smooth, shudder-free shifts and protects against wear and harmful sludge in automatic transmissions.
- AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid – Provides a stable viscosity over a wide temperature range, ensuring excellent ABS and traction-control responsiveness for safe stopping.
- AMSOIL 100% Synthetic Multi-Vehicle Power Steering Fluid – Reduces friction and helps seals remain soft to prevent leaks while offering excellent high-temperature performance for quiet operation.
- AMSOIL Gasoline Stabilizer – Essential for seasonal storage, this additive keeps fuel fresh for up to 12 months and protects against the varnish and gum buildup common with ethanol-blended fuels.
- AMSOIL P.i.® Performance Improver Gasoline Additive – A powerful injector cleaner that restores fuel injectors to 100% flow rate and helps restore up to 14% horsepower in older engines.
The 2.2-liter engine in the Reliant is a robust unit that has stood the test of time, but like any mechanical component, it requires precise maintenance to avoid the common pitfalls of aging vehicles. Using the correct oil grade is paramount. For this engine, AMSOIL recommends 5W-30 across most temperature ranges, with other viscosities like 10W-30 or 20W-40 suitable for specific climate conditions or older engines with higher mileage. The total oil capacity for a standard change, including the filter, is 4.0 quarts. After refilling, it is crucial to check the oil level to ensure it falls within the safe operating range, and the drain plug should be torqued to 20 ft/lbs to prevent leaks.
Choosing the right filter is just as critical as the oil itself. The AMSOIL Oil Filter (EA15K51-EA) is engineered to provide filtering efficiency of 99 percent at 20 microns. This high-efficiency filtration captures smaller particles that standard filters might miss, reducing engine wear and extending the life of your oil. Alternatively, the WIX Oil Filter (51348-EA) offers premium media that improves upon original equipment filters, ensuring reliable flow and protection for your vehicle’s lubrication system.
While the engine often gets the most attention, the transmission and cooling systems are equally vital for the longevity of the Reliant. For automatic transmissions, including models like the A670 and A404, AMSOIL recommends their multi-vehicle synthetic fluids. The AMSOIL Signature Series Multi-Vehicle 100% Synthetic Automatic Transmission Fluid is designed to withstand the rigors of heavy towing and high heat, while the OE fluid provides excellent cold-weather performance and resistance to sludge. These fluids help ensure smooth, shudder-free shifts and protect against leaks. The cooling system capacity for the 1986 Reliant is approximately 9 quarts. Maintaining a proper 50/50 mixture of antifreeze is essential to prevent freezing in winter and overheating in summer. The Passenger Car & Light Truck Antifreeze is a pre-mixed solution, while the Propylene Glycol version is a concentrated option that offers superior corrosion protection and longer service intervals.
Beyond the mechanical essentials, protecting the vehicle’s exterior and interior can enhance the ownership experience. For brake systems requiring DOT 3 or DOT 4 fluid, AMSOIL’s 100% synthetic brake fluid ensures stable viscosity and responsive braking. Similarly, the power steering fluid is designed to keep seals soft and prevent leaks while reducing noise. If the vehicle is stored seasonally, using a gasoline stabilizer is highly recommended to prevent fuel degradation, while AMSOIL Engine Fogging Oil can protect internal components during extended periods of inactivity.
Vehicle Background: The Plymouth Reliant Era
The 1986 Plymouth Reliant represents a significant chapter in American automotive history, marking the continued success of Chrysler’s “K-car” platform that revolutionized fuel efficiency in the late 1970s and early 1980s. By 1986, the Reliant had solidified its reputation as a practical, no-nonsense family sedan and wagon. The specific 2.2-liter inline-four engine found in many of these models was known for its reliability and decent fuel economy, making it a popular choice for commuters and families looking for an economical vehicle.
This vehicle was part of a broader movement where American manufacturers focused on front-wheel-drive layouts, which offered better traction in adverse weather conditions compared to rear-wheel-drive predecessors. The Reliant’s simple yet effective mechanical design meant that it was relatively easy to work on, a trait that has helped it maintain a dedicated following among enthusiasts who appreciate its straightforward engineering. While not a high-performance sports car in the modern sense, the Reliant provided a comfortable and dependable ride for its time, serving as the backbone for many households.
Owners of the 1986 Reliant today often value the vehicle for its simplicity and the low cost of ownership associated with its age. However, maintaining these classic cars requires diligence, particularly regarding fluid changes and preventing corrosion. The 2.2L engine, while robust, benefits immensely from modern synthetic lubricants that can provide better protection against wear and sludge formation than the oils available decades ago. By upgrading to high-quality synthetic oils and filters, owners can extend the life of their Reliant and keep it running smoothly for many more miles. The combination of AMSOIL’s synthetic technology and proper maintenance ensures that this classic American sedan remains a reliable part of the road, ready for daily driving or weekend adventures.
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