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#1622255 - 23/06/2018 22:14 Iridium Plugs
MeanRedSpider Offline
Je suis un Coupé

Registered: 25/03/2006
Posts: 8582
Loc: Cambridge & Cotswolds
Merc went for its annual Merc main dealer service today. It’s done 27k miles and is 4 years old.

Apart from the oil and filter change (and a whole load of other nonsense they add it to make the price not seem quite as obscene) they offered me:
- brake fluid change
- air filter change
- iridium plugs change

I took the fluid change as fluid degrades with age and the air filter change because, well, I’d expect it to be part of a service anyway but declined the plugs - after all, the car has only done 27k and, depending on brand, iridium plugs are meant to be good for up to 100k miles and I can’t see them degrading with age.

That’s fine, the bloke said, but you’ll lose your Mercedes Assistance cover!

So, there I am faced with paying £310 for 6 plugs that don’t need changing or losing (forever, presumably) the Merc breakdown cover. I declined and will call Merc UK on Monday.

I like Mercs to drive but I hate dealing with any part of their after sales.
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#1622268 - 24/06/2018 10:54 Re: Iridium Plugs [Re: MeanRedSpider]
sharman Offline
Making a profit

Registered: 13/04/2014
Posts: 209
Loc: norwich
Wow, talk about bullying tactics. And £310 for 6 plugs!?! Thats £51 each.
I'll never moan again about coupes being expensive to maintain.

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#1622381 - 28/06/2018 12:35 Re: Iridium Plugs [Re: MeanRedSpider]
sugerbear Offline
Je suis un Coupé

Registered: 17/12/2005
Posts: 7669
Loc: Harpenden
What does the service manual say about spark plug changes? Are Iridium the only option?
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#1622383 - 28/06/2018 13:32 Re: Iridium Plugs [Re: MeanRedSpider]
neil_r Offline
Enjoying the ride

Registered: 16/08/2007
Posts: 771
Loc: Germany
When you say "they offered", do they mean that it is part of the required maintenance at that point in time? If it is not, then the treat of removing a service cannot be right?

I assume that the £310 includes fitting at Mercedes dealer rates? The plugs are probably half that total?

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#1622386 - 28/06/2018 16:25 Re: Iridium Plugs [Re: MeanRedSpider]
MeanRedSpider Offline
Je suis un Coupé

Registered: 25/03/2006
Posts: 8582
Loc: Cambridge & Cotswolds
It was an “option”

Yup - might include some labour - can’t imagine its that hard on a front-engined V6 though. They had completed the £400 oil, filter and brake fluid change by 9am...
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#1622399 - 28/06/2018 19:55 Re: Iridium Plugs [Re: MeanRedSpider]
szkom Offline
Forum is my job

Registered: 13/09/2009
Posts: 4624
Loc: ation
As I recall, on the old S type Jag V6, you had to remove the inlet manifold to access the plugs. It might not be as easy as you think on yours

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#1622402 - 28/06/2018 23:26 Re: Iridium Plugs [Re: MeanRedSpider]
MeanRedSpider Offline
Je suis un Coupé

Registered: 25/03/2006
Posts: 8582
Loc: Cambridge & Cotswolds
TBH - the price isn’t my gripe - it’s changing plugs at 27k - or not, and being held to ransom.

That said, YouTube shows that plug replacement on the V6 is as simple as you could imagine: plastic covers off, couple of pipes to remove, then coil packs and plugs.
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#1622408 - 29/06/2018 08:32 Re: Iridium Plugs [Re: MeanRedSpider]
neil_r Offline
Enjoying the ride

Registered: 16/08/2007
Posts: 771
Loc: Germany
Funny, I have an S-Type with those difficult to access plugs smile

Jaguar also used iridium plugs and stipulated a mileage related change on their Vehicle Maintenance Sheet. Time was not an issue for plugs.

I changed them myself when the car was about 11 years old but probably only had covered 40k miles because I was worried that they might get progressively harder to get out the longer I left them in.

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#1622427 - 29/06/2018 12:35 Re: Iridium Plugs [Re: MeanRedSpider]
ScouseCoupe Offline
Club member 1433
Enjoying the ride

Registered: 10/04/2015
Posts: 483
Loc: Huangdao & Ayrshire
My iridium NGK plugs are removed every 25k on a SEAT, but recommended to be changed at 75k, when i had the 80k service, was advised good for another 20k. Mine are in a VW TSI engine.

27k change for a MB sounds bonkers.


Edited by ScouseCoupe (29/06/2018 12:37)
Edit Reason: Spell
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#1622596 - 03/07/2018 09:05 Re: Iridium Plugs [Re: MeanRedSpider]
MeanRedSpider Offline
Je suis un Coupé

Registered: 25/03/2006
Posts: 8582
Loc: Cambridge & Cotswolds
The plot thickens slightly: Merc say that you do not lose your breakdown cover if you choose not to do optional items. Sytner dealerships are wrong to be saying this.

When I raised it with Sytners (Merc Swindon) the lady I spoke to said they’d been telling customers this for at least the last year (the length of time she’d worked there). This raises the question of how many customers have been misled and sold work that wasn’t necessary.
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#1623366 - 27/07/2018 14:34 Re: Iridium Plugs [Re: MeanRedSpider]
MeanRedSpider Offline
Je suis un Coupé

Registered: 25/03/2006
Posts: 8582
Loc: Cambridge & Cotswolds
So the saga continues. After a month of messing about, Mercedes say that it is correct that if you don’t have the “optional” service items done, you lose your breakdown cover, your accident recovery and your 30-year anti-perforation warranty.

He explained that it is “optional” because you can choose not to do it. I retorted that I can “choose” not to service the car at all so I can’t see the difference.

Personally I think that it’s just a scam to make servicing costs seem less and possibly to reduce the cost of the service plans they sell (these “optional” items bring extras).

As I have AA cover anyway and, by servicing the car at any point in the future, you can restore the cover they give, it’s all a total nonsense.
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