I have a 2010 impreza hatch wrxs. After doing an oil change get this weekend, got oil sorted (5w/40 millers) and oem filter. Does anyone know what size crush washer I need? Any info would be great. Also is it worth swapping out the drain bolt and if so what size do info need? 

Don't worry about bolt unless it's knackered or you've stripped the threads it will be fine,

As for the crush washer did you not have one taped to the box ? Normally get shipped out with the filter,

 

 

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Icp or opie sell the crush washers , you could buy a magnetic sump plug and they normally come with a washer 😉

Cheers guys. All sorted