Owner's Manual
Page 363
...air cleaner element removed. Under extremely dusty conditions, replace it more than five minutes at 2,000 to 3,000 rpm. 9. It is recommended that you could be excessive and engine life shortened. It is... The air cleaner element is not installed when the engine backfires, you always use genuine SUBARU parts. 11-20 Air cleaner element The air cleaner element functions as a filter screen....cools down (122 to 140° F [50 to the maintenance schedule in place. 8. Replacing the air cleaner element Non-turbo models Replace the air cleaner element according to 60° C]).
...air cleaner element removed. Under extremely dusty conditions, replace it more than five minutes at 2,000 to 3,000 rpm. 9. It is recommended that you could be excessive and engine life shortened. It is... The air cleaner element is not installed when the engine backfires, you always use genuine SUBARU parts. 11-20 Air cleaner element The air cleaner element functions as a filter screen....cools down (122 to 140° F [50 to the maintenance schedule in place. 8. Replacing the air cleaner element Non-turbo models Replace the air cleaner element according to 60° C]).