For the 2016 model year, Subaru equipped the Impreza with specific engine requirements that owners must understand to ensure longevity and performance. Choosing the correct oil type is not just a maintenance task; it is a critical decision that affects everything from fuel efficiency to the warranty coverage of your all-weather vehicle. This guide breaks down the exact specifications, explaining why they matter for your daily driver.
Manufacturer Specifications for 2016 Impreza
Subaru mandates the use of specific viscosity grades and performance standards to protect the unique design of the boxer engine. Using the wrong weight or failing to meet the certification can lead to reduced efficiency and potential long-term damage. Always refer to the owner’s manual or the placard on the driver’s door jamb for the most accurate information regarding your specific trim.
Viscosity and Certification
The 2016 Impreza requires a 5W-20 viscosity rating for optimal engine protection across varying temperatures. This thin profile ensures quick circulation during cold starts, which is vital for reducing wear in sub-zero climates common in Subaru markets. Furthermore, the oil must meet the ILSAC GF-5 standard, and many models specifically require the Subaru-approved specification known as "SL" for enhanced performance and fuel economy.
5W-20 synthetic blend or full synthetic.
ILSAC GF-5 certification minimum.
Subaru SL oil specification preferred.
Capacity typically ranges from 4.5 to 5.3 quarts.
Frequent stop-and-go driving necessitates strict adherence to these specs.
Turbocharged models (like the WRX) often have stricter requirements.
Synthetic vs. Conventional Oil
While the 2016 Impreoa can technically run on conventional mineral oil, Subaru strongly recommends synthetic blends or full synthetic formulations. The engineering of the engine, particularly the timing chain and the turbocharged variants, relies on the superior lubrication and thermal stability that synthetics provide.
Benefits of Synthetic Oil
Synthetic oil offers better resistance to oxidation and thermal breakdown, which means it lasts longer under the stress of New England winters and summer highway runs. It maintains a consistent viscosity, ensuring that the intricate moving parts of the boxer engine remain protected during high-RPM operation. For drivers who tow or carry heavy loads, this is non-negotiable for maintaining vehicle health.
Enhanced cold-flow properties for easier winter starts.
Superior cleaning agents that reduce sludge buildup.
Extended change intervals, often up to 7,500 to 10,000 miles.
Better protection for high-mileage engines with wear.
Consequences of Using the Wrong Oil
Deviating from the recommended 5W-20 viscosity can have immediate and costly repercussions. Using a thicker oil, such as 10W-30, can cause the engine to work harder, leading to decreased fuel economy and increased internal friction. In severe cases, this can trigger the check engine light or cause the variable valve timing system to malfunction.
Warranty and Maintenance Records
If your 2016 Impreza is still under warranty, using the incorrect oil type is a common reason for claim denial. Subaru dealerships will check the oil type during service; if it does not meet the GF-5 or SL standard, they may refuse to cover repairs related to engine damage. Keeping records of the oil type used is essential for protecting your investment.
