Do my spark plugs need replacing

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amwebby

MB Enthusiast
Joined
Aug 9, 2006
Messages
1,440
Location
Thorpe Bay
Car
CL500
Just booked in for a B service at 92,000 miles. The computer came up with extras in the form of air and fuel filters and spark plugs. Brake fluid had been done by MB dealer at last service.

On checking my Service Book I see that the spark plugs were last done at 58,000 miles in 2006. What are the intervals for change of plugs? Can I legitimately ask the dealer to skip the plug change?

They are offering me 40% discount on labour and 10% on parts as the car is over six years old, so the cost is £475 without the plugs, which seems OK and keeps my MobiloLife intact. Another £300 for the plugs though so I'm keen to avoid this if I can.
 
Get the plugs done at an independent...

Would that really be any saving? The discount brings every piece of work I've been quoted for in line with independent prices.

Besides, I read on this very forum that plugs were a 55k-65k miles/4 year thing. Which would mean mine aren't due for replacement until next year.
 
£300 to change the spark plugs?!

I did them myself on my W124, with genuine Bosch plugs, and it cost me all of about £9
 
The plugs come in at £8.04 each and there are 16 of them. So £129 worth of plugs and two hours labour at £90 equals £309

Just got a quote from the independent and it's not far shy of that.
 
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The plugs are a lot different on the later engines ,

2 plugs per cylinder , on a V , so Webby has 16 plugs to change , the back ones of which will be buried , coil packs have to be taken off , you name it.

I watched Olly change mine ( only 12 ) and i can honestly say , i wouldn't even attempt it myself.

I could change the plugs on my old 124 in about 10 mins though too ...
 
It should cost around £200 at an independent...

I never skimp on plugs as these are often the last thing that anyone thinks of when looking at a car that has developed a misfire or lumpy idle or whatever..

Change the plugs every two years at least for happy motoring.
 
Thanks for the advice but that doesn't answer my question. What is the official servicing interval for spark plugs on a W215?

I may have it done later by the MB dealer, or an independent if I can find a better quote, but I just need to know now if I can legitimately refuse to have it done on this service?
 
I dont know about your specific car but (i think) a rule of thumb for spark plugs in general is every 40,000miles.
 
you can legitimately refuse anything being done... When i took a new car we had for a service at Mercedes i supplied all my own oil, filters etc etc and told them I just wanted a basic service for the stamp as id done the rest myself.
 
On mine i think its 60k but on a lot of the yank forums they say 100k.

Not hard to do at all pull leads unbolt coil packs remove and its all there lots of people make a big deal of this and i admit i was a bit apprehensive based on what i had read.



Lynall
 
That's my impression. If they were last changed at 58k and I'm at 92k now that still leaves a comfortable margin of 25k or more before they need doing.
 
That's my impression. If they were last changed at 58k and I'm at 92k now that still leaves a comfortable margin of 25k or more before they need doing.

Roughly speaking expect them every 50-60k or 4 years.

Its about £200 job with me all in.
 
We were timing him that day remember , but then i had THE phone call ;)
 
Roughly speaking expect them every 50-60k or 4 years.

Its about £200 job with me all in.

Thanks Ollie.

Sadly a trip to the South coast is not feasible at the moment. :mad:
 

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