Thread: Spark Plugs for 3100

Ok I know i did this on another thread, but for this one, i want to know, whats the best for the 3100.

98 GP SE 3100 - stock.

Now right now i have AC delco 41-940 platniums.

And since im changing the LIM, i might as well change the plugs - ive never had the rear ones out.

I want to put new plugs in so i dont have to change them, hopefully for the rest of the cars life.

Am I better going with Autolite XP606 iridiums
or NGK 5599 Laser Iridiums
or is it better to go with coppers??

And if i goto iridiums - is that better for fuel milage.

I dount want to put platinums back in!

Factory Plugs.

Afaik you should be able to use any stock replacement plug in the 3100 they arent picky with plugs like the 3800 is. I would just get any platinum or iridium plug that works don't get coppers.

Al iridium are what I use

Ok ordered NGK laser Iridiums, and NGK wires - should be blue

No spark plug or wire is going to add any hp or performance on our cars.

well depends on what ur plugs look like u have now

mine were platinums but worn badly - NGK TR55GP

and i have better low end now