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As the title says. Dealer informed me that Spark Plugs need to be changed too along with a 45K Service A. $900 bucks BTW, ouch...! An independent foreign mechanic/specialist who has done work for me says that's hogwash and unnecessary. He says they're just trying to sell you.

So I ask do I indeed need to change the plugs at this time? If not when should I? My baby is 1.5 years old and I have 47K miles on it.
 

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The Metris maintenance manual does indeed claim spark plugs required every 45K miles.

Mr Green and many others will tell you that Mercedes engines need their service intervals respected in order to stay healthy.

Most of the rest of the world wonders why any modern engine design should need new spark plugs after only 45k miles.
 

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The sparkplugs on the Metris are multi-fire- they fire between two and ten times a combustion cycle. So at 45k it’s like 100-150k miles on a more common single-fire design. I’d guess they are pretty knackered at 45k.
 

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Actually while I’m at it, running what are probably honestly a bit worn plugs would likely put stress on the rest of the ignition systems- coils, primarily. Replacing the plugs is probably good insurance for not replacing other stuff.

Your mechanic would not be wrong on a less complex design; plenty of plugs can go through well over 100k miles of single fire cycles without trouble. But the single plug in the M274 is actually a replacement for an older twin-plug design. They do something more than double duty on this engine. If you talk to independent mechanics they really need to be Mercedes-specialized. They are a different breed of car.
 

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I’ve been following this forum ever since almost the birth of the Metris, devouring all the praises and brickbats written about it. It seemed like the perfect design for me, but there was maybe an average risk of downtime, and also that I would probably be spending twice the money for maintenance than I have been used to spending on my series of various Japanese and domestic vehicles. For me this an acceptable trade, considering that there is no other vehicle that completely fills my needs and wants.

As for my statement of “average risk of downtime, I direct you to Consumer Reports, which assigns the Metris an “Average” or 3/5 rating on Predicted Reliability and for Predicted Owner Satisfaction.
 

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Phil, if you have the plugs changed by a indy, let them know these are indexed plugs...in other words the thread is cut at a specific point on the plug and they do not have the typical crush type washer. I too was surprised by the 45k change as I'm used to my BMW which has 100,000 miles change which is what I go by. The van is great, I love the power and the great mpg. I'm at 55,000 and not one dime spent.

Lane
 

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Discussion Starter #8
Phil, if you have the plugs changed by a indy, let them know these are indexed plugs...in other words the thread is cut at a specific point on the plug and they do not have the typical crush type washer. I too was surprised by the 45k change as I'm used to my BMW which has 100,000 miles change which is what I go by. The van is great, I love the power and the great mpg. I'm at 55,000 and not one dime spent.

Lane
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Thanks Lane...! I really appreciate that input. Funny, I had the Service A done at my indy and he thought it absurd to change the plugs that early. Based on everyone's feedback I will go back very soon.
Tha
 

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Not only are these engines single plug vs multi plug like the previous generation of MB engines...its also multi spark, meaning it can fire the spark plug several times per compression stroke to optimize fuel burn....which adds wear to the plugs.

There's only 4 plugs....who cares if they need replacing every 40-50k? Not exactly a life changing expense.
 

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So what indy shop (city, state) prices are people getting?
 

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Not only are these engines single plug vs multi plug like the previous generation of MB engines...its also multi spark, meaning it can fire the spark plug several times per compression stroke to optimize fuel burn....which adds wear to the plugs.

There's only 4 plugs....who cares if they need replacing every 40-50k? Not exactly a life changing expense.
I don't think anyone is saying anything about this being a life changing event. It was just a question.
 

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Just out if curiosity, why not just change spark plugs yourself? It takes less time, cost only parts. I've never had someone change plugs for me in 30 years of driving cars. Pop the hood, put on the radio, brew a cup of coffee, 30 minutes later it's done.
 
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