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People dont really change coils preventatively on a schedule and do it when there are issues...
If your car is stock then they can last quite long... ive read up to 140k miles even...
Your driving style also plays a role... aggressive driving asks more from them...
Usually people change them at 60k miles or there about...
I changed mine a bit past 60k i think... i was on stage 1 tune and had some hesitation issues...
Tuned cars ask alot more from coils and sparkplugs.
Recommended sparkplug change interval gets cut in half when running a tune.. And coils get their life shortened aswell...
if you dont mind spending extra 200 now and then... then good plan to change them out is every other/ second sparkplug change...
so for stock cars:
plugs at every 30k miles... then coils every 60k miles
for tuned cars:
plugs every 15k miles... coils every 30k miles..
but you can just wait for them to act up and then change them... and thats what usually happens...
Changing coils is very simple... just remove engine beauty cover, unplug them and pull them out... new ones in, plug wiring back in, put cover back on and you are done.
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2009 35i DCT Havana brown with ivory white interior. Mods: Cobb stage 1+FMIC, Wagner EVO1 FMIC, BMS DCI, KW V3 suspension, M3 front control arms, Hardrace RTAB, Michelin Pilot Sport 4S tires.
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