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Factory instructions requested - M256 engine spark plug

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Old Jan 13, 2026 | 12:09 PM
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2021 E450 wagon
Factory instructions requested - M256 engine spark plug

Hello - does anyone have access to the factory instructions to change the six spark plugs on a 2021 E450 engine? I have watched a couple Youtube videos and wanted specific directions. Thank you in advance. Perhaps Koenigstiger will see this.

Last edited by ds61; Jan 13, 2026 at 05:05 PM.
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Old Jan 14, 2026 | 11:35 AM
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It is a bit questionable to share WIS documents here and seems you don't have private messages enabled, cannot give you any download link.

You could try to search by the document number: ap15.10-p-1580e.
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Old Jan 14, 2026 | 11:45 AM
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2021 E450 wagon
Thanks Diesel Benz. I searched the web for that document but did not find the exact match. I believe I have enabled direct messages now on this forum, if you can send me the WIS download instructions. Thank you.
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Old Jan 14, 2026 | 01:32 PM
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'21 E450 All-Terrain (Hightech Silver)
why is it bad to post a guide publicly?
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Old Jan 14, 2026 | 05:11 PM
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Originally Posted by ab9014
why is it bad to post a guide publicly?
Workshop Information System (XENTRY WIS) is proprietary and is only available by paid subscription.

Unauthorized publication is intellectual property piracy.

Last edited by ua549; Jan 14, 2026 at 05:13 PM.
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Old Jan 15, 2026 | 03:52 PM
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Originally Posted by Diesel Benz
It is a bit questionable to share WIS documents here and seems you don't have private messages enabled, cannot give you any download link.

You could try to search by the document number: ap15.10-p-1580e.
DO you have anything for an 18 E400? Not just spark plugs lol, but anything else?

Thanks.
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Old Feb 25, 2026 | 12:20 PM
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2018 e400
Originally Posted by ds61
Hello - does anyone have access to the factory instructions to change the six spark plugs on a 2021 E450 engine? I have watched a couple Youtube videos and wanted specific directions. Thank you in advance. Perhaps Koenigstiger will see this.
The attached MB procedure covers many models including yours. Some advice, use only genuine MB plugs and follow specific torque requirements. To remove coils just loop a wire tie around base of coil boot, sinch it up loosely and pull gently while also pulling on the top of the coil. It's a fairly easy and fun job.
Attached Files
File Type: pdf
Replace spark plugs.pdf (265.3 KB, 231 views)

Last edited by OTEKAJ; Feb 25, 2026 at 12:26 PM.
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Old Feb 25, 2026 | 10:04 PM
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You could pay like $15 for AllData. It's a website with literally 99% of anything you could ever need for your Mercedes. I use it all the time for torque specs for my S Class and E Class.
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Old Apr 10, 2026 | 03:12 AM
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Originally Posted by Billyismyname
You could pay like $15 for AllData. It's a website with literally 99% of anything you could ever need for your Mercedes. I use it all the time for torque specs for my S Class and E Class.
i remember all data misses a lot of doc for w213. Almost useless. I use Mitchel 1
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