Modern Subaru engines are built with incredibly tight tolerances. To lubricate these small gaps effectively, Subaru specifies the use of 0W-20 synthetic oil. The ‘0W’ stands for the oil’s flow characteristics in winter (the ‘W’ doesn’t stand for weight!). In Missouri, where winter mornings can drop well below freezing, a 0W oil flows quickly to the top of the engine, protecting vital components during those first few critical seconds of operation. Synthetic oil is engineered at the molecular level to be uniform, meaning it doesn’t break down as easily as conventional oil under extreme heat.

Furthermore, 0W-20 synthetic oil plays a massive role in your vehicle’s fuel efficiency. By reducing internal friction, the engine doesn’t have to work as hard to move its internal parts. This leads to better MPG and lower emissions. While some might be tempted to use a thicker conventional oil, doing so can actually impede the variable valve timing systems and lead to reduced performance. When you Schedule Service and Diagnostics at our facility, we ensure only the exact 0W-20 formulation required for your specific model is used.

The Standard Rule
Most modern Subaru models require an oil change every 6,000 miles or every 6 months—whichever comes first. This ensures that the additives in the synthetic oil remain potent enough to fight oxidation and neutralize acids that naturally form in the crankcase during combustion.

St. Louis Driving
Our local environment is often classified as ‘Severe Driving Conditions.’ Stop-and-go traffic on I-270, short trips where the engine doesn’t reach full operating temperature, and Missouri’s high humidity can cause oil to degrade faster than the standard interval suggests.

The Inspection
An oil change at Sunset Hills Subaru is more than a drain and fill. We perform a multi-point inspection to check your tire pressure, fluid levels, and brake wear. It’s a comprehensive health check that keeps your Subaru ready for any adventure.

Using high-quality oil is only half the battle; the filter is what keeps that oil clean. A Genuine Subaru Oil Filter is specifically engineered with a bypass valve pressure that matches the requirements of the Boxer engine. If a filter becomes clogged, the bypass valve allows oil to continue flowing to the engine (unfiltered) to prevent catastrophic failure. Many aftermarket filters have the wrong pressure setting, which can either starve the engine of oil or allow dirty oil to circulate too frequently.

Furthermore, Genuine Subaru filters use a high-quality filtration media that captures smaller particulates without restricting oil flow. When you are looking to do a DIY oil change, don’t settle for ‘good enough’ at a big-box store. You can Find Subaru Parts directly through our website. Using the correct OEM filter ensures that your warranty remains intact and your engine receives the precise filtration it was designed for. We stock filters for everything from the Outback to the WRX in our parts department.

Why trust your Subaru to a generic ‘quick lube’ shop? At Sunset Hills Subaru, our factory-trained technicians live and breathe the Boxer engine. They use specialized tools designed specifically for Subaru vehicles and follow the exact procedures outlined by the manufacturer. When you bring your vehicle to us, we don’t just change the oil; we perform a holistic check of the vehicle’s health.

We understand that your time is valuable. Our service department is optimized for efficiency without sacrificing quality. From the moment you arrive at our Sunset Hills location, we treat your vehicle with the same care we would give our own. Plus, by maintaining a service history at a certified dealership, you maximize the resale value of your vehicle. If you’re curious about what your current Subaru is worth, you can Get your value trade today and see how our commitment to maintenance pays off.