2012 Subaru Forester Owner's Manual - Page 444

11-22 Maintenance and service & Recommended grade and viscosity Each oil manufacturer has its own base oils and additives. Never use different brands together. For details, refer to "Manual transmission, front differential and rear differential gear oil" F12-8. Rear differential gear oil There is no rear differential gear oil level gauge. To check the rear differential gear oil level, consult your SUBARU dealer for inspection. Power steering fluid & Checking the fluid level & Recommended grade and viscosity Each oil manufacturer has its own base oils and additives. Never use different brands together. For details, refer to "Manual transmission, front differential and rear differential gear oil" F12-8. The power steering fluid expands greatly as its temperature rises; the fluid level differs according to fluid temperature. Therefore, the reservoir has two different checking ranges for hot and cold fluids. Check the power steering fluid level monthly. 1. Park the vehicle on a level surface, and stop the engine.