2006 Subaru Impreza Owner's Manual - Page 302
2006 Subaru Impreza Manual
Page 302 highlights
Maintenance and service 11-23 -30 -20 -10 -20 0 20 0 40 10 60 20 30 80 90 85W 80W 75W/90 40 100 -30 -20 -10 -20 0 20 0 40 10 60 20 30 80 90 40 100 Each oil manufacturer has its own base oils and additives. Never use different brands together. Oil grade: API classification GL-5 Recommended grade and viscosity Be careful not to spill rear differential gear oil when adding it. If rear differential gear oil touches the exhaust pipe, it may cause a bad smell, smoke, and/or a fire. If rear differential gear oil gets on the exhaust pipe, be sure to wipe it off. If the vehicle requires frequent refilling, there may be an oil leak. If you suspect a problem, have the vehicle checked at your SUBARU dealer. SAE viscosity No. and applicable temperature Except STI version B00032 SAE viscosity No. and applicable temperature STI version B00159