Understanding the 2018 Subaru Forester oil capacity is essential for proper vehicle maintenance and longevity. This specific model year, part of Subaru's best-selling crossover lineup, requires the correct amount of engine oil to ensure optimal lubrication, cooling, and performance. Getting this specification wrong can lead to inefficient engine operation or potential damage, making it a critical detail for owners and DIY enthusiasts alike.
2018 Forester Engine Specifications
The 2018 Subaru Forester was available with two primary engine options, which dictated the oil capacity. The base and premium trims featured a naturally aspirated 2.0-liter FB20 boxer engine. Meanwhile, the higher trims, including the Limited and Touring models, came equipped with a more powerful 2.5-liter FB25 boxer engine. Because the displacement differs between these two powerplants, the oil capacity is not a one-size-fits-all figure for the entire model year.
Oil Capacity for the 2.0L Engine
For the 2.0-liter FB20 engine found in the base L, Premium, and Limited trims, the oil capacity is approximately 4.9 quarts. This specification includes the oil filter replacement. When performing an oil change, it is recommended to add the new oil gradually and check the dipstick frequently. Stopping before reaching the full 4.9 quarts allows for precise measurement, preventing overfilling which can cause increased pressure and potential seal damage.
Oil Capacity for the 2.5L Engine
Vehicles equipped with the 2.5-liter FB25 engine, such as the Limited and Touring trims, require a slightly larger volume of oil. The total oil capacity for this configuration is generally around 5.1 quarts. Similar to the smaller engine, this figure accounts for the replacement of the oil filter. Owners should adhere to this specification to maintain the proper oil pressure and ensure the turbocharged-like performance characteristics of the larger engine remain consistent.
Type and Specification
Beyond just the volume, using the correct type of oil is just as important as getting the quantity right. Subaru recommends using a high-quality synthetic oil with a viscosity grade of 5W-30 for most driving conditions. This specific viscosity provides excellent protection during cold starts and maintains stability in warmer temperatures. Always verify the API service rating on the oil container to ensure it meets the standards required to protect the FB20 or FB25 engines effectively.
The Role of the Oil Filter
When calculating total oil capacity, the replacement oil filter is a critical variable that is often overlooked. Different filter designs hold varying amounts of residual oil. Consequently, the "quarts" listed in the manual represent the combined total of oil poured into the engine and the oil contained within the new filter upon installation. Failing to account for the filter's capacity usually results in an overfilled crankcase, which can lead to foaming and lubrication failure.
Checking the Oil Level
After adding the specified amount of oil and replacing the drain plug and filter, it is vital to verify the level. The 2018 Forester does not come equipped with a dipstick tube that extends into the oil pan; instead, it features a dipstick located near the firewall at the back of the engine compartment. Owners must ensure the vehicle is on level ground, the engine is off, and they wait a few minutes after turning off the engine to get an accurate reading. The oil level should be between the "MIN" and "MAX" indicators on the dipstick.
