Ensuring your 2016 Subaru Outback with the 3.6-liter 6-cylinder engine (Engine Code EZ36D 2) receives the correct lubrication is essential for maintaining its performance and longevity. This naturally aspirated boxer engine operates at higher temperatures than smaller 4-cylinder variants and benefits significantly from high-quality synthetic fluids. Proper lubrication minimizes wear, controls heat, and helps the vehicle withstand the demands of all-wheel-drive driving, whether on paved roads or light off-road trails.
Recommended AMSOIL Products
AMSOIL offers a range of synthetic motor oils specifically designed for the 2016 Subaru Outback 3.6L engine. The following options provide varying service intervals and protection levels to suit different driving habits and maintenance schedules. For the best overall protection, the Signature Series delivers superior performance, while the Extended-Life option offers a balance of durability and value. Drivers seeking an economical choice can opt for the OE line, and those with higher mileage should consider the High-Mileage formulation.
- AMSOIL Signature Series 5W-30 100% Synthetic Motor Oil – Delivers up to 25,000 miles of protection, offering 75% more engine protection against horsepower loss and wear compared to standard oils.
- AMSOIL Extended-Life 5W-30 100% Synthetic Motor Oil – Provides up to 20,000 miles of protection with 37% more cleaning power to help keep the engine running smoothly for the long haul.
- AMSOIL OE 5W-30 100% Synthetic Motor Oil – A cost-effective 100% synthetic option that fights sludge and deposits while meeting OEM performance requirements.
- AMSOIL 5W-30 100% Synthetic High-Mileage Motor Oil – Formulated for vehicles over 75,000 miles, featuring enhanced anti-wear additives and a boosted detergent package to reduce sludge and improve performance.
- AMSOIL Oil Filter – Engineered to provide filtering efficiency of 99 percent at 20 microns, this filter allows lower restriction to keep engine parts lubricated and extends service life.
- WIX Oil Filter – A premium aftermarket alternative that offers improvements over original equipment manufacturer-branded filters for reliable filtration.
For the 2016 Subaru Outback 3.6L engine, the oil capacity is 6.9 quarts when including a filter change. Always ensure the oil level is checked after refill. The torque specification for the oil drain plug is 33 ft-lbs, and it is recommended to install a new washer on the drain bolt during every service. Regular oil changes are the most effective way to preserve the life of the boxer engine, which relies on proper flow to cool its horizontally opposed pistons.
Transmission and Drivetrain Protection
The Subaru Outback is renowned for its symmetrical all-wheel-drive system, which places unique stresses on the transmission and differential components. For the automatic transmission, the 2016 model requires a fluid compatible with the TR690 specification. The capacity for a total fill of the automatic transmission is 13.4 quarts. Maintaining the transmission fluid is critical for preventing wear and ensuring smooth shifts, especially in severe driving conditions.
Using a high-quality synthetic fluid designed for continuously variable transmissions (CVT) and modern automatics provides exceptional metal-to-metal frictional properties. AMSOIL 100% Synthetic CVT Fluid is an excellent choice to protect the transmission from sludge and temperature-related problems, allowing you to drive with confidence.
The differential and transfer case also require attention. The rear differential requires GL-5 rated lubricant. Depending on the specific temperature range and application, capacities can vary, but the rear differential typically holds approximately 1.7 pints. For these components, AMSOIL provides a comprehensive line of AMsoil Severe Gear synthetic gear lubes. The AMSOIL SEVERE GEAR® 80W-90 100% Synthetic Gear Lube offers advanced protection against wear and thermal runaway, while containing friction modifiers for limited-slip applications. For different temperature requirements, the AMSOIL SEVERE GEAR® 75W-90 100% Synthetic Gear Lube and the AMSOIL SEVERE GEAR® 75W-110 100% Synthetic Gear Lube are also recommended. These lubes help reduce operating temperatures and extend the life of seals and equipment.
Cooling System Maintenance
Proper coolant selection is vital for the Subaru’s cooling system, which includes aluminum components that are sensitive to corrosion. The cooling system capacity for the 2016 Outback 3.6L is 7.4 quarts. AMSOIL offers antifreeze formulations that exceed original equipment manufacturer requirements, providing protection for up to 150,000 miles or 5 years.
The AMSOIL Passenger Car & Light Truck Antifreeze & Coolant is a unique poly-organic acid (OAT) formulation that is phosphate-, nitrate-, nitrite-, silicate-, borate-, and amine-free. It is compatible with all other antifreeze colors and protects all cooling system metals, gaskets, and hoses. For those who prefer a concentrated formula, the AMSOIL Propylene Glycol Antifreeze and Engine Coolant offers similar long-lasting protection, though it requires mixing with distilled or high-quality water.
Brake Fluid and Seasonal Care
Hydraulic brake fluid is a critical safety component that should be replaced regularly to maintain pedal feel and ABS responsiveness. For the 2016 Subaru Outback, the recommended brake fluid is DOT 3. The AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid provides excellent ABS and traction-control responsiveness. It maintains a stable viscosity over a wide temperature range, ensuring reliable stopping power in all weather conditions.
For owners who store their vehicles seasonally or drive less frequently, additional protection is available. The AMSOIL Gasoline Stabilizer helps keep fuel fresh for up to 12 months, protecting against varnish and gum buildup. To protect the engine during long periods of inactivity, the AMSOIL Engine Fogging Oil acts as a highly-effective rust preventive for internal components. Additionally, the AMSOIL P.i.® Performance Improver Gasoline Additive is a powerful treatment that restores GDI fuel injectors to 100% flow rate after just one tank of fuel, improving fuel economy and horsepower.
Air and Cabin Filtration
Clean air is essential for engine efficiency and interior air quality. The WIX Air Filter is recommended for the engine, offering premium media that improves upon OEM-branded filters. For the cabin, the WIX Cabin Air Filters provide superior filtration to remove dust and allergens, ensuring a cleaner environment for passengers.
About the Vehicle
The 2016 Subaru Outback represents a mature iteration of Subaru’s popular mid-size crossover SUV. Known for its rugged versatility and practicality, the Outback bridges the gap between a standard station wagon and an off-road capable SUV. The vehicle features Subaru’s signature Symmetrical All-Wheel Drive system, which provides constant traction and stability in various weather conditions, making it a favorite for drivers in regions with snow or rain.
The 3.6-liter 6-cylinder engine, known as the EZ36D, is a naturally aspirated flat-six engine that offers smooth power delivery and ample torque for towing or carrying heavy loads. While it does not offer the fuel economy of the smaller 4-cylinder options, the added power comes with the assurance of durability and a refined driving experience. The Outback’s reputation for longevity is well-earned, with many examples on the road well past 200,000 miles. Its elevated ground clearance, robust chassis, and spacious interior have made it a staple for families and outdoor enthusiasts alike. The vehicle’s design prioritizes utility and safety, often featuring advanced driver-assistance technologies that were cutting-edge at the time of its release. Whether navigating city streets or venturing onto unpaved roads, the 2016 Outback continues to serve as a reliable and capable companion for a wide range of driving needs.