have a quick question about some spark plugs
 

i have a 1989 560sec and am looking to change the spark plugs i am thinking about the NGK iridium plugs but i been reading a little bit about the "gap size " ? and i have no idea what i am going to need for my car. can you guys tell me what size gap to buy and if there is any thing else i need to know about buying theese plugs for my car. thanks alot.

Use only the a plug recommended by Merecedes.

Read the following thread for my reasons for this. I had a spark plug failure in an 1987 420SEL some time ago.

http://www.peachparts.com/shopforum/showthread.php?t=94360&highlight=plugs