Are these the correct Plugs for my car - Mercedes Benz SLK Forum

SLK R170 General Discussion SLK 200, SLK 230K, SLK 320, SLK32 AMG

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#1 Old 08-29-2013
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Are these the correct Plugs for my car

I pulled a plug out of the 320 V-6 this morning and the type in the engine right now are:
Bosch Platinum F8 DPP 33

The plugs I bought when I got the car because the dealer indicated these are one of the plugs this car uses are.

Bosch Super Plus Platinum Iridium FR8 DPP 33+

Have I bought the wrong one's or will they do fine in this engine?

Thanks
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#2 Old 08-29-2013
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Take the iridium plugs back and get the platinum Bosch. The iridium will start causing misfires before long. Some people have some luck with them but most end up replacing them long before the platinum would start causing issues. MB engines are very finicky when it comes to plugs.
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#3 Old 08-29-2013
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Thank you DIYGirl I called the dealer about the plugs I bought from them and he insists that they are the correct type of plug for my car and will not exchange or take them back. This is what I found out about them they are Mercedes Platinum Spark Plugs OEM Bosch FR8D PP33+

It says on the plug Bosch Super Plus along with FR8DPP33+

On the box it says FR 8DPP33+7422+44

Do you still think I have the wrong plugs, I hate changing 12 of them only to find out later that they are know good. But then again I hate waste

Thanks

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#4 Old 08-29-2013
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From the owners manual for my '03 SLK320.

Bosch F 8 DPER
Beru 14 FGH 8 DPUR X 2
NGK PFR 5-11

Len
2003 SLK320 40,000 miles - now lives in Tucson with my daughter
1959 220S Cabriolet - sold - now lives in Malta
1983 240D 351,000 miles original owner - sold
1999 E300D 215,000 miles
2014 Smart electric 17,000 miles
2014 Smart electric 9,000 miles
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#5 Old 08-29-2013
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I know several of the guys on here with the 55 and they prefer the Super Plus. They can be used in your car and will not harm the car. AutohausAZ has them listed as a replacement for my 2001 but it is not OEM. I had originally ordered the Super Plus like you have and read a post in another forum about the fact that iridium had caused some misfire issues in the 320 (M112 engine). I have tried to locate that post for another member that is having misfire issues with his 320 while using the iridium and it stopped when replaced with the platinum, OEM Bosch.

My thought on the plugs are this: You have them. You are doing it yourself. They will not harm the engine. You may get 30K or 50K or even 80K before there is an issue. Just keep in the back of your mind that if you start to have misfires or the CEL, then check the plugs first.


Maybe some of the other senior members here can chime in on their experience. I am really new to this wrench game myself. Good luck
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#6 Old 08-29-2013
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BTW-If you do not already have the MB Boot pulling tool, order it. It is worth the money and time to get it. You could just use an opened ended 17mm wrench but you will have much less knuckle skin than you started with once you get to the plugs closest to the firewall. It is especially recommended if you are not replacing the plug wires at the same time or if you need to pull a boot later on to check an issue and want to make sure the wires are not damaged. Look for MB Spark Plug tool on ebay. I got mine for $18 and no shipping. They range from $18 to $38 depending on who you get them from.
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#7 Old 08-30-2013
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Since you can't return them or replace them, you can try to go to your local mb dealer and ask them if you can use the plugs. If you can use them then install them but don't let them stay in there for too long. There are a lot of posts in other forums that iridium spark plugs can last more than 100k miles. But I highly doubt it. It all depends on how you're using the car. If its your everyday car and occasionally you do some spirited driving, then the plugs will wear out earlier than what is advertised. If you are also the type of person who knows how to determine a worn out spark plug or checks the plugs regularly then you can use the iridium. But if not dont risk it. I always replace the spark plugs every year, because I don't want to have problems in this area or spend a lot if a problem arises because of faulty spark plugs. In my case, I only have 4 plugs to replace so its cheaper to replace every year. It'll be a waste if you don't use the plugs you already bought, so to be sure and have peace of mind ask the mercedes mechanic. Or you can buy new platinum plugs then sell the iridium plugs you have. Oh I also recommend using the platinums instead of the iridium, not only because iridium potentially has more problems, but because platinums are cheaper. There is no such thing as lifetime parts, all parts wear down, so its better to replace them regularly than risking it.
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#8 Old 08-30-2013
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Thanks for all the input. I bought the car as my retirement toy and to be honest the only reason I was going to replace the plugs was that where I got the car knowone seems to have any record if or when they might have been done. Seeing as the car was from the USA and has 54000 miles on it I figured I'd change them out as I did with the oil and filter, air filters and cabin filter. The car runs great with the plugs that are in the right now and on the motorways I get 32-34 mpg Imperial which seem fine to me, however I hate to leave steel plugs in Aluminium heads for any length of time. My last car I put 2200 miles on it in 2 1/2 years this one I will use more but it's not what I would call a daily driver by any means. I will be putting it in storage at the end of October untill the end of April, the snow in this area of Canada can get quite bad my wife and I live in a snow belt and have many times got up in the morning to find our outside car covered in snow. So this little honey which we both love will be off the roads for half the year and then used to take me for my morning coffee at Tim's and back home again and a drive out on a Sunday with the wife.

guys Thanks again for all your input
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#9 Old 08-30-2013
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Spark plug choice

There is a thread that mentions spark plugs here.
You can find links in there to the "decode" sheets, so you can work out what the features for these plugs are, and compare with the standard.
The worked examples are for the SLK230, not the 320, but show how the trend can be spotted between all the "stock" plugs.

Plug manufacturers will always push their newest and most profitable plugs, but that does not mean that these advances *do* improve ignition for the engine. (Read in that thread about how the "V" plug for NGK failed to benefit my tuned Vauxhall)

I would be inclined to pick the standard plugs from a preferred supplier (in this case, my preference would be Bosch or NGK)

And remember this about the dealer; if he pushes expensive plugs that do not suit the car (for whatever characteristic), and refuses to refund unused plugs, then he should be avoided for all sorts of other things.
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#10 Old 08-30-2013
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Thanks Tolak just checked the Bosch site you sent me in the USA and they say that the FR8DPP33+ is the first one listed on their site and that's what I have at home so that says I have indeed got the right plugs for this car,

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#11 Old 09-04-2013
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Update to correct plugs

I want to thank all that answered my question regarding the correct plug. The dealer I got them from was indeed correct about these plugs.

In the end I contacted Bosch Canada and asked about the plugs and received this reply from them this morning..


Hi William,

Part # FR8DPP33+ replaces part # F8DPER.

You can proceed with installing the FR8DPP33+ for your 2001 MB SLK320 V6 3.2L.

Best Regards,

Rob
Robert Bosch Inc.

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