[kmh]

I have a 97 rav4, need to change the spark plugs... do i need single or double ground? thx

 

[Brother]

You can use either. Double ground plugs last a little longer. There is only ever one spark that goes from the electrode to the grounds. With two, it will find the one that has a more efficient path. This helps you get a little more life out of the plug before you notice anything. The stock plugs are two ground plugs.

 

[Jeff]

Go with NGK or Denso plugs.