[Johnnyr135]

Ok guys have you seen this, all of my spark plugs had this orange coating on them and they were causing the engine to misfire. They all had to be replaced, now I did put 104 octane racing fuel in my car once unleaded. And I have used octane boost, BMW said that it is from one or both of the 2 and that they would not replace the plugs again for free next time. They said that only BMW products can be put in the engine otherwise the plugs will foul. What do you think caused my plugs to foul, I only run 93 octane and I put in Octane boost every once in a while. Are there better plugs or is racing fuel bad. I am going to the strip tomorrow morning and was wondering if I should not use racing fuel