I that case,
Change the oil every time you think of it, with the best quality stuff you can afford, and always with geuine subaru oil filter!
Don't bounce her off the rev limiter, or do doghnuts, either will kill your engine,
If you have access to maxols petrol, (E5) 99ron then use that, much better once she's mapped to suit!
You should only use the bottom few clicks on DCCD, All the way back is trickiest (mostly RWD) but the most nimble, So if you master that you'll be flying!
Use 1st or second click in the wet!
Best of luck!
Dan