best choice in spark plug for my w202 ?

[C280Sportster]

It's time to change all 12 of my spark plugs (1998 C280). What plugs do you recommend ?

[Andrew C280]

are you shure there are 12 i though my car had 12 as well but it only had six 1997 C280 only the high proformance 6 has 2 plugs per cyl. I am running bosch platnuim 4 plugs

[Rocky]

On a V6 there are 2 per cycliner so 12 total.

On a Inline 6 there are only 1 per cylinder so 6 total.

[MBDragracer]

Denso iridiums seem to be all the buzz lately. They are about $12 a piece through Autozone (of all places)...so a bit pricey for 12 but apparently well worth it. I installed them in my C36 not too long ago and was very pleased with their performance until my wiring harness crapped the bed soon thereafter.

Have fun replacing twelve in a V. Should be nice and time-consuming!

Cheers!:cool:

[Andrew C280]

wow interesting what is the advantage of the extra spark plug in the V6 its not HP ?

[Rocky]

Originally posted by Andrew C280
wow interesting what is the advantage of the extra spark plug in the V6 its not HP ?

The extra plug is actually for emissions control I believe.

[Andrew C280]

dose your C36 have two per cyl.

[SpEeDy230]

actually everybody should read this. I was told by a couple of mechanics from the dealership here in vegas that you should only run merc. recommended plugs. because I was using platnium 4's in my wagon and it ended up causing damage. Do not run anything but merc recommended plugs because the spark energy may be too hot with those other plugs. So im running regular merc plugs from the stealership.

[Andrew C280]

what did it do to your car some times techs are full of crap

[SpEeDy230]

The techs there are my dads friends and when they pulled the platinums out of my wagon it looked pretty bad. They were telling me that running those would actualy be bad for my motor. Even the wholesale parts manager ( my dads close buddy ) had said the same thing.

[J Irwan]

That is actuallly correct

unless your car is installed with platinum plug from the factory I would stay away from platinum replacement plug.

I havce been using Beru Ultra-X (non platinum) for 3 years it was agreat improvement over stock. Theyre about $7 each.


And recently I tried Denso Iridum (although I don't feel much improvement from Beru Ultra-x, well actually Ultra-X has better throttle response on my C36). But if you replacing stock with Denso Iridium, I am sure the different would be like "day and night" :)



Regardz,

[SpEeDy230]

yup......in my C im running bosch ultra plugs from the dealership.

[Andrew C280]

interesting how can i check and see if its damageing anything ?

[Rocky]

Originally posted by Andrew C280
dose your C36 have two per cyl.

C36 = Inline 6 = 1 plug per cylinder

[C280Sportster]

Originally posted by MBDragracer
Denso iridiums seem to be all the buzz lately. They are about $12 a piece through Autozone (of all places)...so a bit pricey for 12 but apparently well worth it. I installed them in my C36 not too long ago and was very pleased with their performance until my wiring harness crapped the bed soon thereafter.

Have fun replacing twelve in a V. Should be nice and time-consuming!

Cheers!:cool:

I know !


Bosch recommended these three:

F8DPP332 O.E. SPARK PLUG M112.920; Gap=.040 Locate Retailer

4418 PLATINUM+4 M112.920; Do not Gap

4301 PLATINUM2 M112.920; Do not Gap

I was thinking about going with the Denso iridiums.

We'll see.

[MBDragracer]

Platinum plugs run too hot for our motors and have a tendency to blow coil ends, I've been told. The Denso Iridiums do not appear to present the same problem.

[Rocky]

I dun get it. What exactly is wrong with the OEM Bosche one?

[C280Sportster]

Originally posted by MBDragracer
Platinum plugs run too hot for our motors and have a tendency to blow coil ends, I've been told. The Denso Iridiums do not appear to present the same problem.


I thought the recommened plug was a plat. plug, because we have 100,000 miles change intervals.


My Owner's manual:

Bosch F 8 DPER (gap .032 in)


Bosch website:

F8DPP332 O.E. SPARK PLUG M112.920


I have read about problems with certain plugs in the twin spark engines...I just can't recall which plugs.

[Rocky]

i think it's the plugs that have a 'R' designation that stands for resitor type plug. M104's don't need a resistor type plug.

[BenzMeister]

a 99 C280 with the twin spark engine, (12 plugs) and a very good mechanic plus my dealer said only use Mercedes plugs in this engines. The extra spark plug is for high speed driving or acceleration and provides more spark over 3500 RPM as more air is sucked into the duel intake manifold pipe. the new twin cam V6 has a neater system the duel intake manifold has a flap that open up the high side tube, where the single cam relies on the MAS to reroute more air to the high side, the high side of the intake manifold is smaller in diameter then the low side allowing more compression of the air so you get a hotter spark for better performance driving. very neat set up which many people don't know about or understand fully, think of it as a mini hemi setup. This setup is also why the V6 torgue band is so wide, starts around 3500rpm up to 5500 rpm and with a few illegel tweaks the range can be extended to redline I was told.:)

[C280Sportster]

Originally posted by BenzMeister
a 99 C280 with the twin spark engine, (12 plugs) and a very good mechanic plus my dealer said only use Mercedes plugs in this engines. The extra spark plug is for high speed driving or acceleration and provides more spark over 3500 RPM as more air is sucked into the duel intake manifold pipe. the new twin cam V6 has a neater system the duel intake manifold has a flap that open up the high side tube, where the single cam relies on the MAS to reroute more air to the high side, the high side of the intake manifold is smaller in diameter then the low side allowing more compression of the air so you get a hotter spark for better performance driving. very neat set up which many people don't know about or understand fully, think of it as a mini hemi setup. This setup is also why the V6 torgue band is so wide, starts around 3500rpm up to 5500 rpm and with a few illegel tweaks the range can be extended to redline I was told.:)

Wow, is there a "chip" or something that can increase our power?

Do you know of any other good engine mods?

I'm going to use the recommended plugs, I just don't want to buy them at the dealer.

The owners manual recommened:

Bosch F 8 DPER (gap .032 in)

[BenzMeister]

Originally posted by C280Sportster
Wow, is there a "chip" or something that can increase our power?

Do you know of any other good engine mods?

I'm going to use the recommended plugs, I just don't want to buy them at the dealer.

The owners manual recommened:

Bosch F 8 DPER (gap .032 in)


Using the recommend plugs are fine, if you can find them in a independent auto shop. There are several computer upgrades, buy if you do a search you will find out that most of them do not add much if any horsepower and are expenses. You could go with a free flow exhaust, cat back, that will add a pony of two. Also have your dealer reset the transmission back to default, these drive by wire transmission are driver adaptable, I had mine reset when I bought the car as the shift's were sluggish at best, after a couple of days of "performance" driving, the cars shift quicker and stays in gear longer. Start with 4 gear setting, this is the performance setting, the ration are tighter and if your a "performance" driver this is the setting to use, except if you do a lot of highway driving, then stay in five. I have also experimented with shift from 2, 3 to 4 and finally 5, but you got to watch your tach, there is a engine rev limiter, but driving like this will quickly ruin the tranny, so as I said have the tranny set back to default and start the reprogram in 4 when satisfied go to fith. Actually you can probably start in 5th and reprogram just as well, but a Mercedes person told me the 4th first procedure, and stay away from the redline, each time you hit it the computer records it and the dealer can tell how many times you redlined the engine. I find the best performance in 4th between 3500 RPM and 5000 RPM, after that you "blowing smoke"

[Ashkan's C280]

what about ngk iridium are those better than the other spark plugs? I was thinking of changing mine to get a little better response, but not sure which to buy, I mean 10 bucks a pop or whatever low price it is, i don't mind spending whatever is the cost....

[jnenad16]

i would go with either splitfire, beru silverstone or beru ultra-x, and stay away from platinums(unless thats what the manual states)

[Ashkan's C280]

so which one out of all of those is the best?

[jnenad16]

its a tough decision between the two beru plugs, the silverstone has faster ignition because it doesnt have a resistor,
but the ultra-x might give you better combustion in the higher rpms. i am running silverstones right now and i like them.

ps check out these new plugs, my friend just installed them in his 328i and he says they are awesome

www.e3sparkplugs.com

nenad

[Denlasoul]

Originally posted by BenzMeister
The extra spark plug is for high speed driving or acceleration and provides more spark over 3500 RPM as more air is sucked into the duel intake manifold pipe.
Based on this statement, is it better to run a different gapped plug for this secondary plug? If so, can someone explain the difference in gap sizes? Lastly, how can you tell which plug is the secondary one?