I have used Bosch Platinum +4 Plug with good success on several other American cars (Aurora, Grand Prix, Cadillac). My wife has a '98 S70 NA with 85K miles and I am ready to change the plugs. I thought I might use the +4 plugs but when I went to check for the part number I was surprised to see that there were no +4's lised for this car. They listed the standard platinums but no the +4's. I could swear that I has seen these plugs used on a Volvo before so I did some more searching. It looks like they do have a listing for +4's on 850's and also they list the same standard platinum plug that they list for the S70. Of course it is the same basic plug and temp range. Can someone tell me why they do not list the same plug for the S70?

I am sure I could get many opinions about the advantages of OEM or other brand plugs so let me just say that I haven't actually decided to use the +4's. I also have a mind to just use the OEM's since the car has always ran so well. I am really more just curious about why and who decided that the S70 should not use them.

Thank you,

Kenric Rose