Should Subaru use 0w20 or 5w30?

[DelMatteo]

Subaru uses 0w20. The 'w' stands for winter, indicating it's for winter use. The '0' before the 'w' represents the viscosity at low temperatures. The smaller the number, the better the fluidity at low temperatures and the stronger the cold resistance. The '20' refers to the viscosity at 100 degrees Celsius. The larger the number, the higher the viscosity and the stronger the heat resistance. Taking the Forester 2021 2.0i Luxury Edition as an example: The manufacturer of this car is Subaru, classified as a compact SUV, with a naturally aspirated intake form, a maximum horsepower of 154ps, a maximum torque of 196nm, a CVT continuously variable transmission, and a 5-door, 5-seat SUV body type.

[McJayla]

I've been driving a Subaru for five years, and most of my friends use 0w20 oil because it's particularly suitable for modern Subaru engines. Newer models like the Forester or Outback all use it, as it helps save fuel and reduces engine wear. When the weather is cold, the engine starts up quickly and is less likely to seize, thanks to the oil's good flow, which protects internal components. Sometimes, for hardcore off-roading, people might opt for 5w30—it's thicker and helps prevent high-temperature knocking—but generally, it's unnecessary. Subaru's factory recommendation is primarily 0w20. I've checked the manual, and high-mileage older cars can occasionally use 5w30, but otherwise, it's best not to switch randomly to avoid increased fuel consumption. During regular maintenance, I stick to the manufacturer's recommendations—this extends engine life and reduces noise. If the weather gets unusually hot, I check the oil viscosity and adjust accordingly.

[Susie]

As an average Subaru owner, I initially used 5W30 engine oil but found it unsatisfactory—slower acceleration and higher fuel consumption. Switching back to 0W20 made a noticeable difference, especially with smoother cold starts in winter. My Subaru XV strictly follows the manual's recommendation, as thinner oil lubricates the engine better and reduces friction. During hot summers, I occasionally consider 5W30 for long trips or aggressive driving, but Subaru's original design favors 0W20 for lower maintenance costs. My advice: always check the owner’s manual before deciding—like me, sticking to the recommended oil improved engine smoothness and reliability while ensuring safer driving. Monitor oil changes regularly to avoid premature wear.

[LeNatalie]

When choosing engine oil, I prioritize economy. For Subaru, 0W20 is better as its lower viscosity significantly improves fuel efficiency, saving money in the long run. Compared to 5W30, which has slightly higher fuel consumption especially in city traffic jams, 0W20 is less affected by temperature and adapts to most weather conditions. Make sure to check the oil type and avoid mistakes, as Subaru engines prefer thinner oil to enhance efficiency. For daily maintenance, 0W20 is sufficient, simple, and safe.

[StChristopher]

I'm curious about the meaning of motor oil grades. The 0 in 0w20 indicates ultra-low viscosity in cold weather for easy flow, while the 20 after W represents the high-temperature protection level. 5w30 is slightly thicker, suitable for older cars or high temperatures. Subaru often uses 0w20 because its precision engines require thinner oil to reduce wear and improve responsiveness. Driving habits determine whether a switch is needed—0w20 suffices for gentle driving, while modified cars or frequent aggressive driving might try 5w30, though it's not mandatory. Always refer to the manual to choose the right grade for engine health.