splinter

NGK's LFR7AIX has proven suitable in several members’ modified rides.
If yours is stock, replacement OE ILFR6A NGKs will trot out all the ponies for which you’ve already paid.

Do avoid replacement plugs with less than the specified 26.5 mm/1.04 inch reach though.
More intel…https://mbworld.org/forums/w211-amg/...der-plugs.html

grane

The so called Bosch Platinum (on the box) fr6...Is actually a platinum iridium plug like the NGK mentioned in the Us OM. It says so right on the plug, but not on The box! An AMG insider told me either plug is ok for the stock M113k engine. Pure platinums or multielectrode plgs are a no no.

Bank 3 is hard to change so I would check there to see if the shop actually changed the plugs. If they are ***** to take out or the wire is too tight or the brand/imprinting on the plugs is different they most probably weren't changed.

I think you paid a silly amount for the change I think about $500 to six at a stealer is right and half that at a mb specialist indie.

I keep my own service records and do scheduled services at the dealer at a discount to keep up the warranty. If they do the reset that means they acknowledge the compliance, IMO.

Another way one can tell if the plugs were changed in a 5 yr engine if one or two are really hard to remove. Good practice is to use a dollop of antiseze on the plugs and a tad of dielectric grease on the

splinter

photo credit unknown: pilfered from another member

jpohl402

Got some questions regarding which plug to use - could use some insight.....

Went to a friend who pulled up CarQuest auto supply company for repair facilities. Put in vehicle year, info, etc...
About 12 types of plugs came up (though Bosch isn't a supplier)
Very confused as to specs !!!! Need to know which to choose....

ALL 3 are listed as OE Exact Fit - but all different
1. Denso Part 3324 - (Gap??) 0.044 - Iridium Plug - 9.35/each
2. AutoLite part APP5325 - Gap of 0.032 - Double Platinum ?? - 4.66/ea
3. NGK part 3588 - Gap 0.039 - Iridium - 12.06/ea

Thanks for help !!