See also:

Lubrication oil circulation in the refrigerant circuit
Operate the air conditioner compressor at a low engine speed (at idle or low driving speeds) a few minutes each month during the off-season to circulate its oil. ...

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”. ...

Turbo models except STI
1) Power steering fluid reservoir 2) Manual transmission oil level gauge (MT) 3) Clutch fluid reservoir 4) Brake fluid reservoir 5) Fuse box 6) Battery 7) Windshield washer tank 8) Engine oil ...