Subaru Impreza Manuals 2010 Impreza Owner's Manual | Page 344

11-24 Maintenance and service & Recommended grade and viscosity Each oil manufacturer has its own base oils and additives. Never use different brands together. Rear differential gear oil & Checking the gear oil level Oil grade: API classification GL-5 SAE viscosity No. and applicable temperature Except WRX STI 1) Filler hole 2) Drain hole 3) Oil level Remove the plug from the filler hole and check the oil level. The oil level should be kept even with the bottom of the filler hole. If the oil level is below the bottom edge of the hole, add oil through the filler hole to raise the level.