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For a 2001 Subaru Forester, it is recommended to use SAE 5W-30 oil with an API oil grade of SJ or SH. If these are not available, SG oil can be used as an alternative. Opting for 5W-30 oil can improve fuel efficiency, but Subaru suggests switching to a higher viscosity like 10W-30, 40, or 50 in hotter temperatures for better engine protection. In extremely high-temperature areas like the desert, a viscosity rating of 20W-40 or 50 with the same oil grade is advised. It's important to regularly check the engine oil level, ideally once a week or every time you refuel. Maintaining the correct oil level is vital for optimal engine performance, and regular oil changes are essential for prolonged engine life.
The 2001 Subaru Forester should use ILSAC GF-4 oil, which is labeled with the ILSAC certification mark (Starburst mark) or API classification SM with the designation "ENERGY CONSERVING". It's best to use an SAE viscosity of 5W-30.