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  #1  
Old 05-08-2009, 03:23 PM
Cobra1
 
Join Date: Oct 2005
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Do I need to replace spark plugs? W210

Bought E320 new in 2000. Now only 62K miles on it - wife's. I'm getting ready to change oil, filter, etc. myself. (All maintenance done my MB dealers in past.) In researching, I note that owners manual says to change sparks at 100,000 or 5 years. Looked back thru all my MB service invoices, no spark plug change ever. It's way under mileage but now over 9 years old. Should I change them? It runs great, always has.
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  #2  
Old 05-08-2009, 04:04 PM
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Yes, the longer you wait the more likely they'll be stuck.
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  #3  
Old 05-08-2009, 04:13 PM
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spark plugs

It is my opinion and practice to remove spark plugs, inspect them, clean and re-gap once a year regardless of what MB says. You can be certain they will not "freeze" in place that way. I cannot imagine leaving them in place for ten years. Asking for trouble, I think.

Against some advice, I also clean the threads and give them a spot of anti-sieze when reinstalling. Has served me well for many years of automotive and motorcycle maintenance.

Last edited by rocky raccoon; 05-08-2009 at 04:14 PM. Reason: correct spelling
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  #4  
Old 05-08-2009, 04:52 PM
pawoSD's Avatar
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I'd pull and at least check them, but with the cheap cost of them I'd just go ahead and replace.
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  #5  
Old 05-08-2009, 05:10 PM
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They aren't really all that cheap - ~$10/each. And there are 12 of them.
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  #6  
Old 05-08-2009, 05:19 PM
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Quote:
Originally Posted by jcyuhn View Post
They aren't really all that cheap - ~$10/each. And there are 12 of them.
Whoa, never mind then.

I like my M103 even more now! 6 spark plugs for about $2.30 apiece!
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'82 300SD 322k -mine (OC-323,450) -for sale
'89 420SEL 149k - mine (OC-152,550)
'93 190D 2.2 - 209k - mine (OC-213,000)
'05 C240 4matic Wagon - 133k - wifes (OC-138,000)
'82 300SD 341k -dad's (OC-346,300)
'87 420SEL - 311k - dad's - (OC-314,550)
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  #7  
Old 05-08-2009, 05:28 PM
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replace them. if you go more than 60, 70k, then the rest of the ignition system gets stressed. you'll end up replacing wires and coils. way more money then the 120 usd for the plugs. good luck, chuck.
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  #8  
Old 05-09-2009, 08:45 AM
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The 100K miles or 5 years should have stated "which ever comes first". The factory does not put any anti-seize on the plugs or dielectric grease on the boots. You will find not only the plugs difficult to get out but the plug boots will be a pain to remove as well. Plan on spending several hours to replace your plugs.

My 98 E320 is on it's third set of plugs at 163K miles. I changed them out every 80K. The factory plugs were the most difficult to remove, since then I treated the plugs and boots and removal has been much easier.
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  #9  
Old 05-09-2009, 09:44 AM
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fwiw, I've done probably a hundred or so spark plug changes on 112/113 engine and have yet to encounter a single stuck plug. Including many well past the recommended service interval.
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  #10  
Old 05-09-2009, 09:46 AM
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plugs

********** has oe plugs for less than $5 a piece
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  #11  
Old 05-09-2009, 09:47 AM
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plugs

lol
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  #12  
Old 05-09-2009, 11:17 AM
david s poole
 
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just for your info the plug wires will prob go bad before the plugs so if you are going to take plugs out[not the world's easiest job]replace the wires at the same time.
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  #13  
Old 05-10-2009, 05:39 AM
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I am wondering if 100,000 miles is too soon to replace plugs in these engines. On my daughter's 2001 CLK320 I replaced them at 99,000 miles about a month ago. The plugs looked battered and pitted, but replacement made zero difference in fuel economy and zero difference in performance or driveability. They could have been left there for another 100,000 miles.

I agree with removing and reinstalling them with anti-seize about every 50,000 miles.

FWIW it took me six hours to replace them. One of the plugs took 45 minutes of loosening and tightening and lots of WD40 to come out.

Harry
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  #14  
Old 05-10-2009, 10:42 AM
Nobody knows nothin'
 
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Quote:
Originally Posted by rocky raccoon View Post
It is my opinion and practice to remove spark plugs, inspect them, clean and re-gap once a year regardless of what MB says. You can be certain they will not "freeze" in place that way. I cannot imagine leaving them in place for ten years. Asking for trouble, I think.

Against some advice, I also clean the threads and give them a spot of anti-sieze when reinstalling. Has served me well for many years of automotive and motorcycle maintenance.
X2, good idea to use the high heat anti-seize which sells for 8.00 for a LIFETIME supply.
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