All plugs being equal??

[00slk]

Going to fit a new set of spark plugs to the SL55 and I have a question.
Do Mercedes use the same spark plugs for all the models?
Many thanks.
Peter

 

[rayhennig]

I very much doubt it. In your shoes, I'd go to MB and get the 100% correct plugs.

RayH

 

[Malcolm Johnson]

Take one out to have look, then you see what it is?

 

[00slk]

Take one out to have look, then you see what it is?

I did remove one to check, and all the dimensions are the same as the plugs that came out of my old SL500. I fitted 2 of the 500 plugs in without issue.
Looking on the Internet they seem to be much the same.

 

[Malcolm Johnson]

I changed my plugs in the SL April 2022. what i replaced was NGK PLKR7A 4288 spark plug platinum, with a Mercedes decal on it.
bought 8 from The green spark plug company £61.30 delivered. Slightly less than Mercedes cost without a decal.

 

[Jason63]

The plug does need to be exactly the correct type. Physically the dimensions may be the same but if the plug runs hotter then you could put a hole in the piston. A cooler plug won't hole the piston but it may foul up.

 

[Malcolm Johnson]

NGK PLKR7A 4288 what was what was marked on the Mercedes plug. The ceramic had the Mercedes mark, the plug was marked NGK PLKR7A 4288.
I have had no over heating problem May 22 went on a road trip. France, Germany and Switzerland. May 24 road trip Spain & France.
Not a problem. Pay your cash make your choice.
Stuttgart gets enough cash off me running old Mercs

 

[mioba]

very much doubt it OP, plug gap and tolerance requirements of the plug. Most plugs look the same on the outside.
Play safe. Trip to the dealers.

 

[00slk]

Thank you guys. The plug that I removed was a Bosch R6 Double Platinum.
I will need 16
Now ordered, blimey, someone will get a good 55 when I advertise it for sale

 

[davidsl500]

Thank you guys. The plug that I removed was a Bosch R6 Double Platinum.
I will need 16
Now ordered, blimey, someone will get a good 55 when I advertise it for sale

Will it come with oars... .? Now thats positively my last joke regarding H2O...

 

[00slk]

Will it come with oars... .? Now thats positively my last joke regarding H2O...

Or's not!!!..........
Last water joke.........nooooo

 

[Mattalski]

Thank you guys. The plug that I removed was a Bosch R6 Double Platinum.
I will need 16
Now ordered, blimey, someone will get a good 55 when I advertise it for sale

Where did you order from eventually? I'm getting a misfire code on my CL55, so I'll also need to get 16 of the little b*****ds. And coil packs probably

 

[00slk]

Where did you order from eventually? I'm getting a misfire code on my CL55, so I'll also need to get 16 of the little b*****ds. And coil packs probably

I got them from Ebay.
Doctor Car Parts is the seller, listed under,
16x Bosch Platinum Spark Plugs for MERCEDES SL R230 5.5 02->06 55.

 

[rayhennig]

I got them from Ebay.

Hope all goes well.

But I do think one should be careful ordering from eBay and other web shops. In my case, the spec is for non-resistor plugs. But many outlets list resistor plugs as compatible and this is simply not true. Yes, the plugs might work but they are NOT what MB specified.

For example, AutoDoc returns this against my car registration and the "FR" references are clearly for resistor plugs. Buyer beware.



RayH

 

[00slk]

Hope all goes well.

But I do think one should be careful ordering from eBay and other web shops. In my case, the spec is for non-resistor plugs. But many outlets list resistor plugs as compatible and this is simply not true. Yes, the plugs might work but they are NOT what MB specified.

For example, AutoDoc returns this against my car registration and the "FR" references are clearly for resistor plugs. Buyer beware.

View attachment 91942

RayH

They do have the same numbers and markings as the plugs removed.
But who knows.
All the history states 30k plug change. I bought the 55 at 94k, it's on 132k now and this is my first plug change. I'll keep you up dated.

 

[Mark Q]

Hi

My 500 is due a set about now. From memory I can easily see, so can reach, 8 of them, how easy is it to get to the other 8 ?

 

[00slk]

Hi

My 500 is due a set about now. From memory I can easily see, so can reach, 8 of them, how easy is it to get to the other 8 ?

It's easier than trying to look for other other 8, my neighbours Avanced Halford kit worked it's magic
We complete the task in less than an hour.
The leads were the hardest to take off the plugs, pull these evenly helps.