Subaru 2003 Legacy - Manual (Page 382)

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Changing the oil and oil filter
Change the oil and oil filter according to the maintenance schedule in
the “Warranty and Maintenance Booklet”.
The engine oil and oil filter must be changed more frequently than
listed in the maintenance schedule when driving on dusty roads,
when short trips are frequently made, or when driving in extremely
cold whether.
1. Warm up the engine by letting the engine idle for about 10 minutes
to ease draining the engine oil.
2. Park the vehicle on a level surface and stop the engine.
3. Remove the oil filler cap.
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4. Drain out the engine oil by removing the drain plug while the en-
gine is still warm. The used oil should be drained into an appropriate
container and disposed of properly.
WARNING
Be careful not to burn yourself with hot engine oil.
5. Wipe the seating surface of the drain plug with a clean cloth and
tighten it securely with a new sealing washer after the oil has com-
pletely drained out.