I apologize to everyone and I swear I have been researching this forum and others trying to get a simple answer to what spark plugs to purchase for my 2007 base crossfire. Most everything I have read gets to technical on specs. Or, everyone say get stock---and as a knucklehead I do not even know whereto get the stock plugs from (hopefully not the dealership. Can someone please just recommend to me the best plugs to get and where to purchase them from.

Thanks everyone

 

Just order a set from Rob at Needwings : NeedsWings Performance Products. NGK Iridium IX Spark Plug Set

 

Thanks ala-xFire.

I am now placing my order as you recommended

 

I use NGK laser iridium plugs. See pic below

 

I used Bosch iridium. working just fine.

 

Where do you gap them ? Merc seems to want .031 (.8mm) which seems awful tight for an electronic ignition. Have also seen .040 (1mm) for XF.

 

According to Rob at Needswings : Recommended gap is 0.039"

 

This is a European car with the recommended gap of 1 mm which is of course .03937", but who is going to quibble if it's at .040".

 

As I recall,, my oem plugs had M/B emblem on one side & NGK on the other.

 

I have a set from an NA and they have a blue MB logo on one side and they are Champion plugs KC10PYPB4. Replaced with NGK BKR6EIX-11.

 

.040" makes a lot more sense though is still tight for a transistor ignition. original Reatta 3800 with Magnavox was .045" but with Delco ignition like mine, .060".