Often manufacturers use a specific break in oil that should be run until the recomended change, which I beleive is 3K for the WRX.
Changing oil prior to that may cause the piston rings to not seat correctly, or as quickly.
I have always been skeptical about the quick drains. The ones I have seen appear to stick up higher in the pan than the stock hole and end up leaving more old oil in the pan IMHO than the stock bolt. I want as much of the sludge in the bottom of the pan out, and often tilt the car accordingly before changing the oil.
The biggest issue on the WRX is changing the filter without getting totally messy. I swear there is at least a cup of oil upstream of the filter that dumps out during filter removal.
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I am a Commodore PET --- Now get off my lawn you kids...
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