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      03-21-2017, 08:49 AM   #1
evilb
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Coils: OEM or Bosch?

Hi All --

I'm about to replace the coils and plugs on my car, and I've seen a few versions of coil replacements. I believe Bosch makes the OEM versions, but there is an actual OEM branded coil @ $53/ea, vs. a Bosch coil at $28/ea.

For those that have replaced coils and plugs on their 2013, which did you go with? Any potential issues with no using 100% OEM branded?

I also see that there is a different part # for the 2014+ coils vs. 2013. Not sure why?

Thanks
Brad
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      03-21-2017, 09:48 AM   #2
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Quote:
Originally Posted by evilb View Post
Hi All --
For those that have replaced coils and plugs on their 2013, which did you go with? Any potential issues with no using 100% OEM branded?
I used Delphi coils, GN10328 and NGK plugs, 97506 purchased from RockAuto.com for $24.89 and $14.12 respectively. If you look on realoem.com and see how many various models of cars the Bosch coil is specified for, it doesn't seem there's anything special about it. Sure, we have a high HP twin turbo, but it seems the coil doesn't care.

The NGK is the plug specified for the stock 4.4 s63tu motor by NGK. I have read opinions of others on this forum that it is a colder plug than the stock Bosch plug. I haven't been able to confirm that, so I took NGK's word for it and used theirs. Both the coils and plugs seem to work just fine.
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      03-23-2017, 06:10 PM   #3
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Quote:
Originally Posted by Used2be View Post
I used Delphi coils, GN10328 and NGK plugs, 97506 purchased from RockAuto.com for $24.89 and $14.12 respectively. If you look on realoem.com and see how many various models of cars the Bosch coil is specified for, it doesn't seem there's anything special about it. Sure, we have a high HP twin turbo, but it seems the coil doesn't care.

The NGK is the plug specified for the stock 4.4 s63tu motor by NGK. I have read opinions of others on this forum that it is a colder plug than the stock Bosch plug. I haven't been able to confirm that, so I took NGK's word for it and used theirs. Both the coils and plugs seem to work just fine.
What is the typical timeline of needing to service your plugs?
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      03-23-2017, 06:39 PM   #4
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I ended up getting the OEM stuff from getBMWparts. The coil packs are in BMW boxes but only say Bosch on the part itself. Will snap a pic and post in here for reference.
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      03-23-2017, 08:20 PM   #5
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Quote:
Originally Posted by PDOT View Post
What is the typical timeline of needing to service your plugs?
I have no idea. My stock plugs are still good as far as I know, and I've saved them, but I was getting a flash tune and wanted to start fresh with plugs and coils. If you don't feel a misfire I see no reason to change them. Run a scan to see if you have any trouble codes every once in a while to keep tabs on things.
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