Subaru Forester 2012 Owner's Manual page 340

11-6
Maintenance and service
NOTE
1) When the vehicle is used under severe driving conditions mentioned in the following examples*, the engine oil and oil
filter should be changed more frequently.
2) When the vehicle is used under severe driving conditions mentioned in the following examples*, inspection should be
performed at every 15,000 km (9,000 miles) or 12 months, whichever occurs first.
3) When the vehicle is used under severe driving conditions mentioned in the following examples*, the air cleaner element
and air filter should be replaced more frequently.
4) When the vehicle is frequently operated under severe driving conditions, such as towing a trailer or driving on sand,
replacement of automatic transmission fluid, differential gear oil (front and rear) and manual transmission gear oil should be
performed more frequently.
5) When the vehicle is used under following areas, change fluid every 15,000 km (9,000 miles) or 12 months, whichever
occurs first.
(1) Areas with high humidity levels
(2) Mountainous areas
* Examples of severe driving conditions:
(1) Operating in extremely cold weather (Items 1, 2 19, 21 and 22 only)
(2) Towing a trailer (Items 1, 2, 12, 13, 15 and 17 only)
(3) Repeated short trips (Items 1, 2, 15 and 16 only)
(4) Driving on dusty roads (Items 10, 15, 16, 19, 21 and 22 only)
(5) Driving on rough and/or muddy roads (items 15, 16, 19, 21 and 22 only)
(6) Driving in areas using road salt or other corrosive materials (items 8, 15, 16, 17, 19, 21 and 22 only)
(7) Living in coastal areas (items 8, 15, 16, 17 and 19 only)