Im about to do an oil change, what do you mean upper engine clearer? All I was going to buy was an oil filter from subaru, 5L oil and a new washer for the oil leak plug.

I've never changed oil on a wrx as I've only had this for 5 months and it had a service 5000km's ago, is there anything I NEED to know that is unique to WRX's? And I have searched google for a service manual and on more than one occasion people say it is impossible to find one? O_o it seems a tad odd.

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WRX Club Spec Evo 4

it is a can which you spray into the inlet manifold by removing a vacuum line and spraying it down using the supplie nozzle

instructions are on the can

and everyone will tell you differenty, but it does not matter if you use it before or after the oil is changed.

can get it from the dealership

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2000 WRX - Grip King
1997 Sileighty - Gate Monster

I got oil filter, washer & upper engine cleaner for about $50ish from memory

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2016 Subaru Outback - Work Wagon
350NM of CVT Goodness
Pit Crew, shit talker.

if it helps, just youtube upper engine cleaner will be very clear then

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98 gf8 Rip