Which spark plugs good/bad?

[johnathan1]

I currently have the stock (I believe) Denso plugs right now...but I would like to change them because their mileage is unknown...

So, would everyone please state their opinions? I have heard that Splitfire, Bosch, and basically any platinum plug are really bad...why is this? And from what I understand, the good ones to use are NGK, Denso, or Autolite Coppers...

Can anyone give me some insight on which I should go with?? Oh, and my Supra is stock BTW...

 

[Yellow 13]

NGK R


NGK anything at that.

 

[mrnickleye]

I've run Autolite Platinum in every vehicle for several years and NEVER had one fail. That's all we use at the shop.

NGK Platinum would be my 2nd choice.

 

[suprajjang]

i have the denso iridiums and havnt had a single problem with them

 

[Doward]

Autolite 3923s here

 

[Facime]

Also running Irridiums, but have nowhere near enough miles on em to have an opinion yet, other than to say they work fine, no problems

 

[koulee]

Who told you plat plugs are bad? They come stock on our cars. I'd go with ngk or densos. Running bosch douple plats no problems here.

 

[mattjk]

bosch platinums are horrible. The ones with the very tiny tips.

 

[97TSiAWD]

Autolite 3923s here

Same here.

 

[Kai]

NGK's here

 

[IJ.]

A lot depends on the HP level and use/tune of the car

IR's were great while I was at low boot but overheat and gloplug during extended high boost runs while NGK coppers at the same heat range are fine but don't last as long.