Originally Posted by Munit
So I had my 30k service done and got the plugs changed, oil etc. I actually had changed the plugs myself at 10k miles as I had used some octane booster from torco which works but frys the plugs! So I changed them myself and drove 20k miles and when I took the car back it was so much more crisp and snappy acceleration. Was like the spark was not up to snuff and full combustion was not happening if that is possible.
I will definetly do more of a 15-20k spark plug change as it is a really easy DIY and worth keeping the engine in absolutely brand new functioning
The Torco race fuel concentrate does turn the plugs a nice orange but I don't think it damages them at all. I know guys with Shelby GT500s and C5/6 Vettes that are in the 600-800rwhp range that use Torco race fuel concentrate to probably a higher level than you did with no detriment. From my understanding the plugs start to lose efficiency even without the fuel concentrate at around the 18-20k mark anyway.
The Torco stuff is pretty good...
2013 M3 Coupe-MR/BLK ZCP, ACM test pipes, BPM Stg2 dev. tune and Megan catback, AFE Stg2. with C/F elbow VMRV810 19x10&19X11 275/295 Mich PSS.
Previous rides: 2011 M3 Coupe-MR/Blk
2007 Porsche 997C2S Speed Yellow/Blk sport seats
2004 BMW M3 Imola/Blk