Re: Diamond Fire E3 spark plug
Okay, pretend I didn't say iridium.
I still say platinum is the best available.
I have used Bosch platinum (the mid priced ones, not the $8 ones)for years in all types of motors and always had great service from them. They last MUCH better than regular plugs.
If more is better, then too much is just enough.
If you can't afford it, build it yourself.