People are still dealing with 30 year old information when synthetics leaked because they were not compatable to gaskets and seals. And that oil did not have the additives to prevent seal swell or shrinkage. There is no truth to rumer that synthetics leak more than dino oils.
A quality synthetic can go several times the length of oil change interval than that of dino oils , although a used oil analysis should be used to verify that.
If you change oil every 3000 miles you are throwing away money no matter what oil you use. Also the Mobil 1 oil filter is way overpriced and does not have the correct bypass setting for the Subaru engine.
Be careful what you wish for.