I received the dealership notice for my 1 st. 3000 mile service including oil change on Monday and Thrusday I had the service.
I discussed the syn. oil option and the service writer advised not to. The dealership used a GTX 5X30 replacement.
I have driven my machine aggressively from one thousand BENCHMARK mile on.
I felt some differents in the idle by 2500 miles, so I asked that service tech check the idle.
The Senior tech road tested my machine and he placed on the
analytic scope or select monitor as subaru calls it on the invoice.
I talked to him he said no code showed, that the idle was 100%
on target. The test revealed all was fine. He heard nothing and felt nothing different during test drive.

 

I wouldn't worry about the idle. Most likely, the car is just settling in.

/\rcanum