From: *** Smalley
Sent: Tuesday, October 28, 2014 8:15 AM
To: 'classicparts@mbusa.com'
Subject: Spark plugs
I belong to a MB online forum and there has been much debate about the type of spark plugs to use in certain engines. For example my w201 calls for Bosch H9DC0 (non-resistor) or Champion S12YC. Well both manufacturers have superseded those non-resistor plugs with resistor types HR9DC0 and RS12YC. So now the plugs all come with resistors. Is there an issue with using the successor plugs? For the record, I am currently using the Champion RS12YC plugs in my w201 that has the m103 engine and I have not had any issues, but I would like the MB engineers' take on this. I understand that the manual gives a list of specific plugs and I have that list, however since the manufacturers no longer make the plugs that are listed in the MB manual then what would be the problem, if any, with using the updated ones? I have also contacted both manufacturers and they have stated that the plugs are fine to use in place of the previous ones. Thank you.
_________________________________________________________________
From:
thomas.hanson@mbusa.com [mailto:thomas.hanson@mbusa.com]
Sent: Tuesday, October 28, 2014 9:28 AM
To: **************
Subject: non-resistor spark plugs
In many case we have had to switch over to NGK spark plugs. They still offer non-resistor plugs for many of our cars. I don’t have their part number for the smaller plugs used in the 190E and 300E models, but they should have an online chart.
Kind regards, / Mit freundlichen Grüßen,
Thomas Hanson
Supervisor, Parts Operations
Mercedes-Benz Classic Center
Mercedes-Benz USA
Email:
thomas.hanson@mbusa.com
Phone: 949-598-4842
Fax: 949-598-4870
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_________________________________________________________________
From: *********************
Sent: Tuesday, October 28, 2014 3:13 PM
To: Hanson, Thomas (171)
Subject: Re: non-resistor spark plugs
So in your opinion, should the updated resistor spark plugs not be used on the engines that call for non-resistor type plugs? Please advise. If so, I will need to contact my local dealer to see if they are in stock. Thank you.
_________________________________________________________________
From:
thomas.hanson@mbusa.com [mailto:thomas.hanson@mbusa.com]
Sent: Tuesday, October 28, 2014 4:20 PM
To: *********************
Subject: RE: non-resistor spark plugs
NEVER use resistor plugs in any of our engines that call for non-resistor. It will never run properly.
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And there you have folks. The official answer from MB USA. I am currently running Champion (RS12YC) resistor plugs in my M103 and I haven't had any issues except for a few hiccups here and there, but nothing major. However, I will be switching to the non-resistor plugs on my next oil change. Hopefully this dead horse will finally remain dead.
