[Dawgz]

Anyone use these Spark Plugs on their X3MC?

FCP shows these are OE and are cross referenced under OEM part # 12122455258.


** Update **

Should have searched more.

Found two threads that confirm this is okay to use.

https://x3.xbimmers.com/forums/showthread.php?t=1737548
https://x3.xbimmers.com/forums/showthread.php?t=1833657



** Update #2 ** (Just sharing info)

Part # 12125A4EF60 is what the dealership told me comes up for my VIN. RealOEM does not have this one listed and only lists 12122455258

12125A4EF60 will be superceding 12122455258.

[Dawgz]

Finally did them, stock '20 competition, no aftermarket tune yet.

7k miles!

Had a slight hesitation at idle, you could feel it in the cabin, car would slightly shake.

After the change it's very smooth, no more hesitation.

Gapped the new plugs to .022

[JB20DGM]

How many miles on those plugs?

[Dawgz]

Originally Posted by JB20DGM

How many miles on those plugs?

7k! Lol

[corbs09]

I feel like they updated the part number when the M3 came out. Turner lists the part number with the 58 at the end as our plugs, but the dealer told me it was the plugs with 60 at the end. Wonder what they were correcting when they updated the plugs?

[Dawgz]

Originally Posted by corbs09

I feel like they updated the part number when the M3 came out. Turner lists the part number with the 58 at the end as our plugs, but the dealer told me it was the plugs with 60 at the end. Wonder what they were correcting when they updated the plugs?

Just the part number, the plug is the exact same.

12125A4EF60 (as a part number) will be superceding 12122455258.

[JB20DGM]

Originally Posted by Dawgz

7k! Lol

Seeing those I'm much less dubious of the prescribed change interval.

[Dawgz]

Originally Posted by JB20DGM

Seeing those I'm much less dubious of the prescribed change interval.

Lol ya, I plan to change these yearly. Hopefully FCP starts carrying this exact part soon so I can get free replacements.

They do carry part # NGK 95248 which is supposed to be a OE replacement but the NGK plug # shows as SILZKGR8C8S while the stock plugs are SILZKGR8E8S.

I'll have to call NGK and see what the difference is if any.

** Update **

I just called NGK and the technical support rep told me both SILZKGR8C8S & SILZKGR8E8S are exactly the same, same heat range as well.

I was also told by NGK that NGK 93560 is one step colder (I DONT think we need this on stock or stage 1&2 tunes).

[Dawgz]

Btw when trying to break these stock plugs loose, I can safely say that the factory torqued these down way past 16-17ft lbs. Felt more like 23ft/lbs rather than 23NM

[corbs09]

Originally Posted by Dawgz

Lol ya, I plan to change these yearly. Hopefully FCP starts carrying this exact part soon so I can get free replacements.

They do carry part # NGK 95248 which is supposed to be a OE replacement but the NGK plug # shows as SILZKGR8C8S while the stock plugs are SILZKGR8E8S.

I'll have to call NGK and see what the difference is if any.

** Update **

I just called NGK and the technical support rep told me both SILZKGR8C8S & SILZKGR8E8S are exactly the same, same heat range as well.

I was also told by NGK that NGK 93560 is one step colder (I DONT think we need this on stock or stage 1&2 tunes).

Appreciate you doing the legwork here. I just changed my plugs after a year and 14k miles and am pretty sure its going to turn into a service I do once a year.

[Dawgz]

Originally Posted by corbs09

Appreciate you doing the legwork here. I just changed my plugs after a year and 14k miles and am pretty sure its going to turn into a service I do once a year.

Np! It's good maintenance.

[Edgar_FriendlyX3M]

Was the plug gapping of .22 factory spec or your choice?

[Dawgz]

Originally Posted by Edgar_FriendlyX3M

Was the plug gapping of .22 factory spec or your choice?

Just my preference as I will be tuning soon.

Runs just fine on it with the stock tune as well.

Factory gap looked like it was larger than .025 maybe .028?

[Edgar_FriendlyX3M]

Originally Posted by Dawgz

Just my preference as I will be tuning soon.

Runs just fine on it with the stock tune as well.

Factory gap looked like it was larger than .025 maybe .028?

Ok thanks!

[Dawgz]

Just drove the car. It's Soooooooo much more peppier. No more hesitation at idle or stumbling at idle.

[Edgar_FriendlyX3M]

Originally Posted by Dawgz

Just drove the car. It's Soooooooo much more peppier. No more hesitation at idle or stumbling at idle.

You've got me thinking I should do plugs. I'm at a little over 14k miles with similar but barely noticeable symptoms. When does the dealer scheduled plug replacement happen?

[Dawgz]

Originally Posted by Edgar_FriendlyX3M

You've got me thinking I should do plugs. I'm at a little over 14k miles with similar but barely noticeable symptoms. When does the dealer scheduled plug replacement happen?

25-30k

[JB20DGM]

Originally Posted by Edgar_FriendlyX3M

You've got me thinking I should do plugs. I'm at a little over 14k miles with similar but barely noticeable symptoms. When does the dealer scheduled plug replacement happen?

It seems to be based on oil changes as opposed to mileage, dealer did mine at 12k with an oil change and other scheduled maintenance.

[Edgar_FriendlyX3M]

Originally Posted by JB20DGM

It seems to be based on oil changes as opposed to mileage, dealer did mine at 12k with an oil change and other scheduled maintenance.

Ok. I'll have to see if I can find out if they were done at that point.

[Dawgz]

Originally Posted by JB20DGM

It seems to be based on oil changes as opposed to mileage, dealer did mine at 12k with an oil change and other scheduled maintenance.

I wonder what they use for the interval to deem it necessary (like every other oil change?).

I was going to take mine to the dealer for this hesitation but thought it would be the plugs (which, thankfully, it was) so I just did them at home. I saw someone else on the forum saying they had similar issues and after putting new plugs the issue went away.

So maybe its good to just do these every 5k...(every oil change).

[FSociety]

Great thread!

[Edgar_FriendlyX3M]

I've had other cars where plugs wasn't even something to bring up under 100k miles. I understand the x3m is a high performance vehicle but...