Im getting ready to change my plugs. Im wondering if anyone has any experience with the Denso iridium plugs on the S4.
Any opinions on using a non oem plug.
Im running giac software and usually keep the car in pump

 

I am planning to change my plugs too and any spark plug suggestions will be appreciated.

What does it mean when I have a little bit of oil in the spark plug cylinders?

 

that the gasket needs to be replaced it is like a 30- 45 dollar part that jsut sucks to do, I run stock plugs gaped at 28 and have not had any problem other then when my o2's right after that.

 

pepsicolla, sorry for stealing the thread. readimag, are you talking about the gasket under the intake manifold? I got it changed when I replaced the aux pump.

 

Not a problem, I would suggest taking the valve cover off again and checking or replacing the plug gasket. It comes with most valve cover gaskets. They are sometimes missaligned and pinched once the valve cover is installed.
take a look, Its really not a tough job.

 

ive had good experience running a copper plug gapped around .22 to .25.. yeah.. you have to change them more often but they run cooler than iridium or platinum and have less chance of being blown out before combustion occurs, especially running over 15 psi of boost...

 

wow thats good to know.
shoot now im really torn