Spark Plug Replacement Interval

[TWiTCHY]

NGK 97506

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]

This is the sparkplug socket I bout a few months ago, and worked perfectly when I swapped out the autolites for a set of NGKs...

https://www.amazon.com/gp/product/B073PT5M2R/ref=ppx_yo_dt_b_asin_title_o08_s00?ie=UTF8&psc=1

the supra comes with Autolites stock? If so thats reason enough for me to change

 

[ToyoBMW]

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]

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]

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.

 

[ToyoBMW]

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]

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]

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.

 

[jtsang25]

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.

https://www.supramkv.com/threads/everything-up-to-50k-miles.16878/post-261693

 

[niso_iso]

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

 

[Carbon0]

Just replaced mine at 39k(6k of them tuned) with ngk 96206

I don’t know enough to make a comment about their condition but they look pretty bad to me.

Does anyone know if the interval for the ignition coils the same?

After looking into some info about reading them. I think this looks like standard wear and tear but correct me if I’m wrong.

 

[lucky phil]

Here's a tip. Modern fine wire electrode precious metal plugs in general have a very long lifespan and 60,000klms is often the quoted manufacturers replacement interval which for the average person is around 4 years. Some even go 80,000klms. The issue is that although the plug electrodes can still deliver good running at those sort of intervals I'm not that convinced the plugs from a mechanical perspective should be left in the head for that period of time. I've replaced quite a few plugs that have been fitted for 5 years or more and the removal process is often a worrying procedure. It's clear that the threads in the head don't much like the experience of a 5 year old 60,000klm plug being removed. I've never had a thread strip out or show obvious signs of damage but I can tell from how they unthread it's not a happy place for them. Some Ford engines are renowned for stripping out their plug threads on plug removal due to the extended change interval. Personally on a daily driver 2 years 30,000klm is about all I let them stay in for no matter what the manufacturer will allow.
Phil

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