Spark Plug Replacement Interval

TWiTCHY

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Are you sure? FCP Euro says that spark plug goes on the four cylinder engine and doesn't list any B58 compatibility. https://www.fcpeuro.com/products/bmw-silzkbr8d8s-spark-plug-ngk-96987#description

My research is pointing to NGK 94201/SILZKGR8B8S but I also found SILZKGR8E8S being described as a "stronger" variant of NGK 94201 by BM3 Tuning. Odd thing is, this "stronger" one doesn't seem to have a corresponding NGK part number and the NGK site lists no plug compatibility with the Z4 M40i or M340i, which also makes me question compatibility with NGK 94201. This is confusing AF.
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kissmyrs

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ToyoBMW

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Going back to this old thread, I just got my plugs changed with my 4th Toyotacare Plus service. I was quite surprised that plugs were on the list to change. I only had 6500 miles on my old plugs but since the service called for them, I said go ahead and change them.

The part number is 90118WA461 and they are made by Champion.......so that's probably why it needs to be changed out at the 4 year mark.
 

John8

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Going back to this old thread, I just got my plugs changed with my 4th Toyotacare Plus service. I was quite surprised that plugs were on the list to change. I only had 6500 miles on my old plugs but since the service called for them, I said go ahead and change them.

The part number is 90118WA461 and they are made by Champion.......so that's probably why it needs to be changed out at the 4 year mark.
Well they don't age like an oil might. Not sure why they would change them out. There are some good Japanese plugs. I wonder why the used Champion.
 

Thraxbert

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Also coming back to this thread, it spurred me to remember that Audi VW 06M905606F (made by NGK) is the plug that some sites (ahem, rhymes with heighten) are listing as "tested and PROVEN" upgraded plugs. Except these are under $10 each.

Gap them to 0.028" for 93 octane, 0.020" for ethanol mix. Use feeler gauge leaves, not a gap gauge, like a civilized human being.

These work beautifully.
 
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ToyoBMW

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Well they don't age like an oil might. Not sure why they would change them out. There are some good Japanese plugs. I wonder why the used Champion.
They do it at 4 years because the owners manual states it's required to maintain emissions control warranty
 

jtsang25

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Going back to this old thread, I just got my plugs changed with my 4th Toyotacare Plus service. I was quite surprised that plugs were on the list to change. I only had 6500 miles on my old plugs but since the service called for them, I said go ahead and change them.

The part number is 90118WA461 and they are made by Champion.......so that's probably why it needs to be changed out at the 4 year mark.
Most of the things on BMWs are changed based on time not necessarily miles. You could drive the car for less than 1000 miles but break fluid, plugs etc will be changed based on months/years.
 

D3ad_Hand

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I'm confused what does the owners manual say. I got a service contract and as it is right now it's got 50,000km on the dash so when will they be changed.
 

niso_iso

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Are you sure? FCP Euro says that spark plug goes on the four cylinder engine and doesn't list any B58 compatibility. https://www.fcpeuro.com/products/bmw-silzkbr8d8s-spark-plug-ngk-96987#description

My research is pointing to NGK 94201/SILZKGR8B8S but I also found SILZKGR8E8S being described as a "stronger" variant of NGK 94201 by BM3 Tuning. Odd thing is, this "stronger" one doesn't seem to have a corresponding NGK part number and the NGK site lists no plug compatibility with the Z4 M40i or M340i, which also makes me question compatibility with NGK 94201. This is confusing AF.
Had to look this one up on Turner, looks to be right with the 94201. Specifically the 94201KT2?

Source:
https://www.turnermotorsport.com/p-5135632-b58-performance-spark-plug-set/

Might give this a try on my own
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