2 Questions about Spark Plugs
 

I was going to change my plugs today. I got my plugs last week and today I noticed that the part number is slightly different than what I used last time.

Last time I got Bosch Super WR7DC+ and this time the plugs are WR7CDX+

What does the X mean in the part number and is it ok to use these plugs.

Also, any experiences with the Platinum, Platinum Plus, Quad, Sextuplets, yada, yada, yada, etc...

Thanks in advance....Vern

as a general rule - platinum lasts longer than copper, and has about the same performance - iridium makes the best performance (as much as 5 hp more), but doesn't last as long

you can find out pretty much anything you ever wanted to know about sparkplugs at sparkplugs.com