Starting with two premises: 1) the recommended interval for plug inspection/replacement is 30K miles, and 2) you have to remove the A/C compressor to access four front sparkplugs, the question is...

NGK make an Iridium electrode plug that is quite spendy at $18 each, but are guaranteed for 100K miles. Their standard plugs are around $4 each.

My A/C compressor needs replacement, so it's a good time to do the plugs as well.

At today's labor costs, assuming the A/C compressor has to come off every 30K miles to get to the plugs, isn't it money ahead to go with the iridium plugs?

Or, is this snake oil?

Thanks,

Lou

 

Short answer. Yes they're worth it, most new cars come with them OEM and have no tune up/plug inspection replacement till 100K.

 

Hey Lou, can't comment on iridium,but I put NGK platinum plugs in Beatrix 5 yrs and 60000km ago,when I checked them in October they still looked basically new. I believe the extra cost justifies the time intensive job we V12 owners must deal with.(was my first time in there and was 3 hours)
Les
88 1/2XJ-S

 

It depends on the engine. If it's old Lucas style ignition, no. Old British cars and lawn mowers love Champion plugs.

http://www.motorcarsltd.com/RS9YC.html

Marrelli ignition cars take NGK:

http://www.motorcarsltd.com/EAC8554.html

The 6 cylinder models use a different Champion number:

http://www.motorcarsltd.com/EBC8143.html

No reason to over spend.

 

Thanks Ken & Les,

Well I think I have a Marelli ignition because the distributor cap is a Marelli...Therefore probably worth it to go with the iridium.

Thanks very much for the info.

Lou