Should Subaru use 0w20 or 5w30?
2 Answers
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.
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.
