need to know if its okay to put these spark plugs in my 91 4Runner.

get back to me with any info you have please

spark plug specifics:
(Bosch r3 Platinum r2 / splitfire)

 

Umm yes, but I sure would not!

The best plug to run in any vehicle is the plug the factory put in it.

ETA: I am sure someone is going to complain and say they use Plutonium, laser, quad fire, plugs and they work fine. Many time the an engine is designed around a particular spark plug. Or hundreds of hours go into finding a plug that will produce the most efficient burn in a particular combustion chamber.

There is no point in reinventing the wheel, a basic Nippon Denso, or NGK plug that it calls for will run better than any expensive plug you can find, and they are cheaper.

 

like stanprophet said you could but its best to use NGK or Denso spark plugs.

 

Ditto use Denso of NGK. Way cheaper and its what is supposed to be used

 

Denso or NGK copper plugs in your 3vze only.

 

copper plugs are for carbureted engines only.

 

Um, both are copper core plugs.

Taken from NGK site: http://www.ngk.com/product.aspx?zpid=9325

"Most spark plugs contain a copper core for increased conductivity, improved heat control and improved resistance to fouling."

 

well you do learn something new everyday.

 

 

I tried Bosch platinum plugs, gas mileage suffered. I think it was 10-20 miles less per tank.