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Guys,

Be careful of listings of other NGK plugs, or Online retailers saying they have the plugs for our car.

After a number of discussions with the Technical Dept of NGK Australia today, I can confirm the following: -

MB P/N 139 159 14 00 ONLY crosses over to NGK SILZMFR8B7H, no other NGK number.

It is a number 8 heat range, which in NGK's rating system, is COLD. (As you would expect from an engine with ours's specific output)

The Plug is unique, at least in NGK's product line. They have no other P/N equivalents, physical or otherwise.

It is currently an OEM exclusive.

Yes, best delivery at the moment is August.

What I can't tell you is if Bosch, (or any other plug supplier, if it comes to that) has a REAL equivalent.
I have not spoken to Bosch Australia, which is what it would take.
Perhaps @bladerunner500 could speak to Bosch Germany and advise us all?

Don't anybody bother asking a workshop or retailer.
It is the plug manufacturer themselves, or no one.
 
Has anyone had their 3rd service and experiencing spark plug shortages?

Apparently the dealer have had them on backorder for 3 months but still not turned up and reading another thread on here the ETA is 08/2023!

With the car being out of warranty and I've already contacted part brokers with no luck, what could be used as alternatives?

Part number MA1391591400 (Quantity 4)
My 3rd service was this month but I’ve only done 19k miles so it didn’t affect me. I had service B0.
 
Be careful of listings of other NGK plugs, or Online retailers saying they have the plugs for our car.
I agree. We get the same with tyres. But the right tyre choice is much more visible.
 
Discussion starter · #24 ·
Hi guys

So I now have some important information together and can only confirm what @Turbo Ed says, we can ONLY only drive the NGK SILZMFR8B7H. NO other spark plug will fit.

I spent a long time on the phone with NGK Germany and they confirmed that this is the case. The candle NGK SILZKFR8D-7S does not fit because it is M12 and the 8B7H is M10. Unfortunately completely OEM and not available anywhere else.

I also spoke to Bosch on the phone and they don't do anything for the 45s at all. Unfortunately!

You have to be careful with the websites Fixparts, Europarts+, Woxparts etc., because they state that they have the spark plugs for a1391591400. Here we have to ask explicitly whether it is the NGK SILZMFR8B7H.

Mostly the SILZKFR8D-7S are sent, and that's wrong...

I found 4 dealers here yesterday who have the SILZMFR8B7H in stock, but they didn't want to sell me them, none of them. Otherwise I could have helped you too, at least a few people who urgently need them...
 
There must be a supply currently of the spark plugs we need as MB are churning out a continued supply of M139 engined cars. In saying this I take it that the C-Class engines have the same spark plugs.
 
Ok so we've established that A1391591400 which crosses over to NGK SILZMFR8B7H is the only way to go.

However, if you go to NGK.com you'll see that SILZKFR8D7S is listed as the correct fitment for the 2020 CLA45, in other words for the M139. I get that we should be careful of resellers trying to send us the wrong plugs (knowingly or not) but this is NGK themselves saying they will fit. Could our plug maker be wrong?

And a word about plug longevity. Again on NGK.com if you scroll to the bottom of SILZKFR8D7S specs, it says 100k miles. I don't see the SILZMFR8B7H on there (search shows no results) but I don't suppose they have different longevity. Now for them to last 100k miles, I don't know if it requires granny driving, but in any case, 40k miles is less than half that, so we should be safe up to 60k km which is what dealer said, whether it's you or your wife behind the wheel.
 
Ok so we've established that A1391591400 which crosses over to NGK SILZMFR8B7H is the only way to go.

However, if you go to NGK.com you'll see that SILZKFR8D7S is listed as the correct fitment for the 2020 CLA45, in other words for the M139. I get that we should be careful of resellers trying to send us the wrong plugs (knowingly or not) but this is NGK themselves saying they will fit. Could our plug maker be wrong?

And a word about plug longevity. Again on NGK.com if you scroll to the bottom of SILZKFR8D7S specs, it says 100k miles. I don't see the SILZMFR8B7H on there (search shows no results) but I don't suppose they have different longevity. Now for them to last 100k miles, I don't know if it requires granny driving, but in any case, 40k miles is less than half that, so we should be safe up to 60k km which is what dealer said, whether it's you or your wife behind the wheel.
@Theo,

NGK.com is NOT NGK. (To be fair, they do say that at the top of their website).

NGK Corporate must have been seriously P****d off when they lost / failed to protect, that Domain name!!

In any event, NGK.com is definitely WRONG, (as are every other Reseller I have been able to find), as now confirmed by NGK Australia and NGK Germany, both corporate offices, not deceptive Online resellers.
I warned you guys, the Plug manufacturers themselves, not workshops or Online resellers.

Our plug is definitely OEM supply only at this stage, although I have requested that NGK Australia determine when this (quite common) arrangement ends.
Obviously, I shall advise as soon as I hear.

The biggest irritation to me currently is that neither Bosch nor Denso make an aftermarket equivalent.
Which simply demonstrates one thing.
The (relatively) low numbers of our vehicles in the marketplace.
These decisions are all purely volume driven.
It is obvious nether Bosch nor Denso consider our specific vehicle's usage commercially viable.

I now have qty 20 on order (Aug delivery) at my local MB Dealer, who told me that I have now exceeded $45K AUD (currently around 25K Pds Sterling) in AMG parts purchases for this project.
Not actually sure I needed to hear that!!! :)
 
Can I ask something? It's quite common for tuned turbocharged vehicles, mostly full bolt-on setups and beyond, to upgrade the plugs to colder ones and/or with smaller gap or gap them to your specific requirements. I had grade 8 iridium NGK plugs on my fully bolted stock turbo ED30 GTI that made 390hp, which came from the factory with some 6 grade platinum plugs, from Bosch iirc. Before completing the stock turbo setup, somewhere halfway, I went to 7 grade iridium NGK and as I said ultimately wrapped it up with the 8's paired with R8 coils. Pretty common for these cars, including Golf 6R, Leon 2 Cupra and 8P S3 which all shared the same engine.

So how does that work with our A45s's? Suppose we start tuning our vehicles, aren't we supposed to eventually upgrade the plugs? Or doesn't work that way here? Cause I was thinking, if we were to upgrade to say 9's, there should be an aftermarket plug that can fit. Unless our OEM plugs are good for all setups, including the G30-770 that you're building @Turbo Ed. Frankly, keeping the OEM plugs for any setup beyond stock turbo, is unheard of.
 
Can I ask something? It's quite common for tuned turbocharged vehicles, mostly full bolt-on setups and beyond, to upgrade the plugs to colder ones and/or with smaller gap or gap them to your specific requirements. I had grade 8 iridium NGK plugs on my fully bolted stock turbo ED30 GTI that made 390hp, which came from the factory with some 6 grade platinum plugs, from Bosch iirc. Before completing the stock turbo setup, somewhere halfway, I went to 7 grade iridium NGK and as I said ultimately wrapped it up with the 8's paired with R8 coils. Pretty common for these cars, including Golf 6R, Leon 2 Cupra and 8P S3 which all shared the same engine.

So how does that work with our A45s's? Suppose we start tuning our vehicles, aren't we supposed to eventually upgrade the plugs? Or doesn't work that way here? Cause I was thinking, if we were to upgrade to say 9's, there should be an aftermarket plug that can fit. Unless our OEM plugs are good for all setups, including the G30-770 that you're building @Turbo Ed. Frankly, keeping the OEM plugs for any setup beyond stock turbo, is unheard of.
@Theo,
Always!! :)

Of course, your general outline is correct.
Higher Brake Specific, colder plug, as a rule.

However, in NGK's heat range system, an 8 is pretty cold plug.
Most production engines use a 4, 5 or 6.
The Golf R uses a 7.
The 8 used in our cars would be the coldest plug, using NGK's system, that I have ever heard of in a production engine.

That said, I think you are rather missing the point.
Currently, there is no other plug, of any heat range or design style, from NGK, Bosch or Denso, which physically suits our engine.

So, currently, literally no choice, whatever you might like to try.
 
@Theo,
Always!! :)

Of course, your general outline is correct.
Higher Brake Specific, colder plug, as a rule.

However, in NGK's heat range system, an 8 is pretty cold plug.
Most production engines use a 4, 5 or 6.
The Golf R uses a 7.
The 8 used in our cars would be the coldest plug, using NGK's system, that I have ever heard of in a production engine.

That said, I think you are rather missing the point.
Currently, there is no other plug, of any heat range or design style, from NGK, Bosch or Denso, which physically suits our engine.

So, currently, literally no choice, whatever you might like to try.
No I got that it's about physically fitting our engines, I just didn't expect that there isn't an aftermarket option that can physically fit, even if it was a 9, which I would give a try. I expected there was at least one plug maker that made a more suitable plug for a tuned M139, in which case, I think we would all try, given that our OEM plugs currently require an intelligence agency to track down.

So what are you gonna do? You have already placed an order obviously. What's your mileage? Are you gonna stop dailying your A45s until your plugs arrive? I'm gonna try and go from 400km/week down to 130, so that's 1/3 of where I was, just in case.
 
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No I got that it's about physically fitting our engines, I just didn't expect that there isn't an aftermarket option that can physically fit, even if it was a 9, which I would give a try. I expected there was at least one plug maker that made a more suitable plug for a tuned M139, in which case, I think we would all try, given that our OEM plugs currently require an intelligence agency to track down.

So what are you gonna do? You have already placed an order obviously. What's your mileage? Are you gonna stop dailying your A45s until your plugs arrive? I'm gonna try and go from 400km/week down to 130, so that's 1/3 of where I was, just in case.
LOL!!
My car is off the road so often for thing or another that it shouldn't be a problem.
I am in the work Van or hire cars while travelling for work at the moment, so no issue.
I shall make it to August no problem.

However, more importantly, a couple of things.

1) It is another interesting example, (if any of us needed it) of how difficult AMG has obviously deliberately made it to tune our engine.
Given our vehicle's low production volumes, (by international car company standards), it is quite possible that no other plug manufacturer will ever consider it viable to even build an equivalent service plug, let alone colder heat ranges of what is, after all, already a fairly cold plug.
At some point, NGK's service plug will become available through their aftermarket operations, (though quite possibly not until after the car goes out of production); however, it is quite possible that may be it. For Ever.

2) Another good reason for my approach of standard boost level, increased mass flow through system efficiency, coupled with the lowest possible inlet charge temperature and engine fluids generally.
Hopefully this should enable me to reach my target power levels using the standard, (and only) spark plug!!
 
Quite frankly, had I known all this, the difficulty in tuning our engine, the difficulty in sourcing what should rather be taken for granted, the temp issues, I might have waited two extra years and gotten the RS3 instead, even if aesthetically the A45s wins hands down. But was it worth all this? And the plugs thing just topped it off, I mean seriously that's unacceptable. And the irony is that MB sent me this email saying there is a service coming up which will include the plugs, but when I get there in a couple of months, there will be no plugs to install. And if I hadn't made the smartest move to join this forum, and if it weren't for everyone helping each other out, I wouldn't have known this to at least place an order in advance. Fck this!
 
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My car has been stuck at the dealer for 6 nights now, not sure how long this is going to go on for :( As it's out of warranty even they advise it shouldn't be driven without new plugs.
This is very sad and I feel for you, as I am sure do many others here.
What delivery is the Dealership quoting for new Spark Plugs?
The reason I ask is, most manufacturers keep emergency stocks of consumable items, for VOR situations.
I would have thought your situation fell into this category.
If you can't get acceptable answers from your Dealership, I would be calling MB GB, ASAP.
 
They are advising the vehicle is not VOR and is driveable now. They are advising 2 weeks but if the engine goes bang before new plugs they won't take liability as it's out of warranty.

They want their courtesy car back ASAP!

Not sure what to do with this...
 
I feel for you too. :(

If they're now saying there is a 2 week ETA, they have likely found a set of plugs for you, likely reserved for emergencies as @Turbo Ed said. I would wait it out for now.

What happens if the plugs haven't arrived after 2 weeks and they say you're gonna have to wait longer.

I would contact MB UK directly, explain the situation and if they appear to be in line with the dealer, I would threaten with a lawsuit, based on the fact that they have advised that the car shouldn't be driven with current plugs, which means they acknowledge that the probability of engine damage because of failing plugs is significant, given the extended, and ultimately "undefined" length of time until the plugs are replaced.

If the car now suddenly became "driveable" I would ask that they take full responsibility in case of engine damage and make them sign it, otherwise we're back to the lawsuit.

I don't know what else to advise you, it's a tough situation. Just makes you wonder if you'll stick to MB for your next car, I certainly am having second thoughts. The tuning difficulties are nothing compared to not having a car because of one of the most common consumables in the industry missing. It's sad and hilarious at the same time. How did they fck this up?
 
They are advising the vehicle is not VOR and is driveable now. They are advising 2 weeks but if the engine goes bang before new plugs they won't take liability as it's out of warranty.

They want their courtesy car back ASAP!

Not sure what to do with this...
@crocket

Do exactly as @Theo says and if you would be so kind, report back here next week on what you were told by MB UK

Good Luck!! :)
 
They will tell you to do one, I posted another thread about brake disc judder (which I reported at 2nd service at 4,000 miles as it was getting bad). Never been race started, on original tyres, been complaining about break squeal since new. They decided to void the warranty when it went in for it's 2nd service but the dealership did not tell me this as I removed the OPF and in the court documents it says they voided warranty on the entire car, they should have told me this upfront rather then me paying for brake inspection reports and I would have footed the bill.

I did put in a claim for the cost of parts only, I thought they would just pay up as the cost was relatively small... but nope!

You have to take the supplying dealer to court, in this case they only supplied me the car and has never seen it since as they are not local. MB UK hide behind this, so they cannot be taken accountable directly. The local dealer who are an AMG specialist also sided with the voided warranty from MB UK/MB AMG.

This is the last Mercedes/AMG I'm going to own for the forseeable, ordinarily I wouldn't post parts of their defence but it may help someone at least get the right entity.

Code:
MERCEDES-BENZ CARS UK LIMITED Defendant

1) The Defendant is the importer and distributor of Mercedes-Benz and Smart vehicles in the United
Kingdom (Company Number: 02448457). The Defendant does not own or operate Mercedes-Benz
retail and repair sites. All Mercedes-Benz approved sites within the UK are franchised businesses
owned and operated by separate legal entities to the Defendant. Moreover, the Defendant is not
the manufacturer of Mercedes-Benz vehicles.

2) It is not clear to the Defendant on the legal basis which the Claimant is bringing the claim. The
Claimant has not disclosed any contractual agreement, has not specified what contractual
loss. The Claimant has failed to identify any statutory obligation that the Defendant has allegedly
breached.

5) In response to the limited contents provided in paragraphs 3.5 to 3.9 of the PoC the Defendant
responds as best it can below. In so far as it understands, the
that the braking system of the Vehicle is defective. The Defendant infers the Claimant is attempting
CRA alleging the Vehicle
was not of satisfactory quality and/or fit for purpose pursuant to section 9 of CRA. The Defendant
submits that no contract exists or has ever existed between the Claimant and Defendant pursuant
to section 1 of CRA. The Claimant is put to strict proof regarding its cause of action against the
Defendant.

7) The Defendant asserts that MB D**** found no evidence of an inherent or manufacturing defect
with the brakes or at all with the Vehicle. Furthermore, as the issues with the brakes fell outside
and due to the third party software presence in the Vehicle,
the Claimant as the registered owner/keeper was required to bear the costs for any
repairs to remedy the brake issue.

9) Notwithstanding the above, the Defendant avers it is the incorrect legal entity to respond to the
Claim. The Defendant maintains that any claim under CRA for the Vehicle allegedly being of not of
satisfactory quality and/or not fit for purpose should be directed to the selling dealer, with whom
the Claimant holds the contract of sale.

10) The Defendant denies breach of statutory duty, contractual or tortious liability as alleged or at all.
The Defendant avers that the Claimant has failed to provide a legal basis for its claim and the
Defendant has no contractual relationship with the Claimant.


Mod edit:
Subsequent posts re warranty refusal on Brakes moved to the Brakes thread.

 
Well I wasn’t expecting a call from my dealer till about the end of the year! Ordered my plugs for the A45S a week before last and they arrived today. Slightly baffled as none originally showing on system when i placed the order! Not even in Europe. Like others i was given a date around July/August time. Happy days
 
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