cheapbrass

So I took my car in for a Service B, and the advisor informed me that I was due for a Spark Plug change (dealership wanted $940) since I had hit the 5 year mark (even though I only have 14k miles on my car). He said that the problem with the plugs was the age and not the mileage. Supposedly the contacts on the Spark Plugs could corrode and make it difficult or cause damage to the car if I wait too long to change them out?

I called another Mercedes Dealership (this dealership does it cheaper for $625) and the guy on the phone said...it wasn't necessary to perform a Spark Plug change on my car since I had so little miles on it and I didn't notice any problems in driving it. Now I am confused...should I change out the Spark Plugs or leave them in? Thanks for any advice.

OnlyGerman

I was in the same situation along with the trans fluid. I went ahead and did both. i got a pretty good deal as I did oil change, brake fluid and filters as well. I was at 26k. I won't do the plugs again if I keep it more than 5 years. I mostly opted due to my extended warranty, and did not want any future reasons to deny claims based on not following service manual...

MTrauman

Judgement call as you can see from the two dealerships. Many people never change plugs until there are problems. Other people are black and white about following the manufacturer schedules. There is not a perfect answer. From my standpoint you will waste money if you replace plugs but if you want to run your car a million miles, preventative maintenance would say change the plugs based on time frame.

ygmn

I say change thembased on a mileage base.

If worried about corrosion pull one out and examine... but my take is since they are firing in a cylinder when you drive corrosion not an issue as probably burned off if it was ever there in first place.

Save ya money and go out to dinner a few times.

Mitch Alsup

The worst that can happen if you don't change them is that 1 (or more) will go bad and you change them at that point in time.

sixstring09

Your plugs are still new. No need to replace.

hyperion667

Granted it is (my) AMG, but I'm having plug service today for 400! it's recommended for me every 60K miles or 6 years......I'm sitting on 58K miles and went ahead with it anyway. I can't believe a dealer would say that on a 14K mile car! What gives??

cheapbrass

I also purchased the extended warranty. Would not changing my plugs at the recommended age interval invalidate my extended warranty in the future?

S63AMG888

iTrader: (3)

Mercedes recommends/requires if you don’t want Mercedes to use this as a excuse to decline warranty work if the interval schedule maintenance is not kept.

Schedule interval maintenance is based on every 10,000 miles or 1 year. Another words, if you take delivery of a October 2018 Mercedes and only have 2,000 miles on the car, your required to do the scheduled 1y/10k service because we are in Nov of 2019. Same thing with plugs, transmission.

hyperion667

Yeah, true Thanx for that reminder

MBS63AMG

I just sold my 2017 S63 and never changed the plugs and never had any issue. It had 82,000 miles on it.

cetialpha5

Have you looked into the pre-paid maintenance? Those also include the plugs and transmission fluid. If you car is a lease, it's a crazy good deal because they roll the cost of the package into the MSRP so if you have a 50% residual, you end up only paying for half the cost of the maintenance package even though they're all used up when you turn the car in.

Anyway the reason they give for changing out the plugs is that if you leave them in there too long, they may end up rusting in there and will be difficult to get out later.

Mercedes also went to a multi spark ignition system so the plugs can fire 4-5 times per cycle so even though plugs may last longer than in the past, by firing more often, they get a lot more use than older plugs that only fired once or twice.

https://www.roadandtrack.com/new-car...ech-explained/

CharlyE500

My old school 2006 CLS55 AMG with 105K miles still original plugs.... still run pretty good.... I will need to replace them soon but spark plugs are normally due in 100K miles.