Spark plug OEM Audi or OEM Subaru
Check out getting rs3 spark plugs if it’ll work.
Normally that's a result of a failed spark plug seal. If you have no other problems I would put new spark plugs in it and check them at the next oil change.
Audi A3 spark plugs work like a charm. Stage 2+ & fully upgraded supporting hardware.
Since I've owned my 18 S4 i've done almost everything myself:
4 oil changes, spark plugs at 40k, 2 sets of pads and 1 set of rotors, both air filters.
Since then I have take good care of it, replaced the brakes on schedule in August 2020 and then in August 2021 new spark plugs.
My 2002 had a similar issue. In my case it was the spark plugs, $250 fix.
a spark plug job on an STI can be a 6+ hour job :thumbdown:
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