Picture yourself cruising down the highway in your Subaru Ascent, the engine delivering its trademark performance with a steady hum. But have you ever stopped to think about what keeps that engine running smoothly? It all comes down to what’s inside your engine—specifically, the oil you choose and how often you replace it. Let’s break it all down so you can keep your Ascent in prime condition without the guesswork.
Subaru Ascent Engine Essentials
The Subaru Ascent runs on a turbocharged 2.4-liter four-cylinder engine that’s as practical as it is powerful. Its flat-four design, known as a “boxer engine,” positions the cylinders opposite each other. This setup reduces vibrations and keeps the engine’s center of gravity low, improving stability and handling. It’s compact, efficient, and just plain clever.
This engine produces 260 horsepower at 5,600 RPM and 277 lb.-ft. of torque at just 2,000 RPM. Paired with a continuously variable transmission (CVT) and Subaru’s all-wheel-drive system, this vehicle delivers smooth power while maintaining excellent control. With an EPA-estimated fuel economy of 20 MPG city and 26 MPG highway, it’s balanced enough for daily commuting, long road trips, or a little bit of adventure.
But none of this would matter without the right type of oil circulating through the engine.
Subaru Ascent Oil Type, Oil Capacity, and Change Interval
The engine in your Ascent is a finely tuned machine, and it requires a specific type of oil to perform at its best. Subaru recommends 0W-20 synthetic oil. The oil capacity, including the filter, is 4.8 quarts.
For optimal performance, stick to an oil change schedule of every 6,000 miles. If you’re driving frequently or under harsher conditions, like extreme temperatures or frequent stop-and-go traffic, this interval becomes even more critical. Over time, engine oil breaks down due to heat and friction, losing its ability to properly protect engine components. Regular oil changes ensure your Ascent continues to operate smoothly and efficiently.
Why Synthetic Motor Oil?
Synthetic oil outperforms conventional oil in nearly every way. It’s engineered at a molecular level to be more consistent and pure. That means no contaminants like sulfur or heavy metals hanging around to damage your engine. This streamlined formula reduces friction, improves fuel efficiency, handles extreme temperatures like a pro, and protects against wear.
On the other hand, conventional oil is refined from crude oil. This process leaves behind impurities and creates inconsistent molecules, meaning it doesn’t lubricate as reliably or last as long. While it gets the job done, it can’t hold a candle to the performance of synthetic oil.
Best Synthetic Oils for Subaru Ascent
When it comes to synthetic oil, you’ve got plenty of options, but two stand out for their performance and reliability:
- Castrol GTX Full Synthetic 0W-20: A solid choice that meets all required standards, provides excellent wear protection, and helps you maintain a clean engine.
- AMSOIL Signature Series 0W-20 Synthetic Motor Oil: This top-tier option provides outstanding protection and longer-lasting performance, helping reduce engine wear even in extreme conditions.
While both options work well, AMSOIL is often praised for raising the bar in terms of overall longevity and performance.
Additional Tips for Subaru Ascent Owners
- Look for the Right Certifications: Whatever oil you choose, make sure it meets industry standards like API SP, ILSAC GF-6A, and others Subaru specifies. These ensure the oil provides the protection and performance your engine needs.
- Don’t Skip the Filter: A clean engine oil filter is as important as the oil itself. Replace it during every oil change to avoid contaminants circulating through your engine.
- Watch for Driving Conditions: If you drive in dusty areas, tow heavy loads, or frequently drive in cold weather, you might need to change your oil more often than the standard 6,000-mile interval. Always check your owner’s manual for guidance.
FAQs About Subaru Ascent Oil Changes
Q: Can I use regular (conventional) oil in my Subaru Ascent?
A: Subaru specifically recommends 0W-20 synthetic oil. While you could technically use conventional oil in a pinch, it won’t provide the same level of protection, especially in extreme temperatures. Stick with synthetic for the best performance.
Q: What happens if I delay my oil change?
A: Over time, oil degrades and loses its ability to lubricate and protect your engine. This can lead to higher friction, increased engine wear, reduced efficiency, and potentially costly repairs down the road. It’s best to stay on schedule.
Q: How can I check my oil level?
A: It’s simple! Park your car on a level surface, wait a few minutes after turning off the engine, and use the dipstick to measure the oil level. Make sure it falls between the “MIN” and “MAX” markers.
Q: Can I mix different brands of synthetic oil?
A: While it’s best to stick with one brand for consistency, mixing shouldn’t harm your engine as long as both oils meet the required standards. However, don’t mix synthetic oil with conventional oil.
Q: How do I know when my oil needs changing?
A: In addition to following the 6,000-mile rule, watch for warning signs like low oil levels, dirty or dark oil, dashboard alerts, or the engine running louder than usual.
Discover everything you need to know about the Subaru Ascent’s features and performance here on MotorTrend.
Final Thoughts
Taking care of your Subaru Ascent’s engine doesn’t have to be complicated. Using 0W-20 synthetic motor oil, changing it every 6,000 miles, and keeping an eye on your oil filter are the keys to long-term reliability. Whether you go with Castrol GTX or AMSOIL Signature Series, both are excellent choices that deliver the protection your engine deserves. Remember, maintaining your oil change schedule is an investment in your Ascent’s performance and longevity. Treat your vehicle right, and it’ll reward you with miles of smooth, hassle-free driving. For more details on high-performance motor oils, explore: Castrol here and AMSOIL Signature Series 0W-20 100% Synthetic Motor Oil here.