F30 N20/N26 spark plug changes@60k, can it last till 75k - Bimmerfest - BMW Forums



Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 3 Series & 4 Series > F30 / F31 / F32 / F33 / F34 / F36 (2012 - current)

F30 / F31 / F32 / F33 / F34 / F36 (2012 - current)
The sixth generation BMW 3 Series Sedan F30/F31/F34 and the first first generation 4 Series Coupe F32/F33/F36. Get the latest 3 and 4 series pricing from our ordering and pricing guide sticky thread.

Reply
 
Thread Tools Display Modes
  #1  
Old 09-17-2019, 11:49 AM
namelessman namelessman is offline
Officially Welcomed to the 'Fest
Location: northern california
 
Join Date: Dec 2004
Posts: 11,986
Mein Auto: bimmer
F30 N20/N26 spark plug [email protected], can it last till 75k

My spark plugs were changed around 60k miles last year at a local indy for $150 with BMW parts. It should be OK DIY but proof of the job can help with 15 years/150000 miles warranty.

My plugs looked exactly like those from the following thread. The question is, could these plugs have lasted till, say 75k miles?

https://www.bimmerfest.com/forums/sh...ght=spark+plug

Also, does anyone know the difference between SILKBR8C8S(installed at factory o my N26), SILKBR8D8S(dealer stock), and SILKBR8E8S(from picture of attached thread) plugs?
Reply With Quote
Sponsored Links
Advertisement
 
  #2  
Old 09-17-2019, 12:10 PM
adhrp adhrp is offline
Officially Welcomed to the 'Fest
Location: US
 
Join Date: Feb 2014
Posts: 635
Mein Auto: 2012 F30 328i
Someone on the other forum reported their 335i has well over 100k miles and they haven't changed their spark plugs. So certainly seems possible, but not recommended.

See this thread starting post #65 onwards: https://f30.bimmerpost.com/forums/sh...1512602&page=3
__________________


2012 328i Luxury Line | Glacier Silver/Saddle Brown | Premium pkg | Tech pkg | Cold weather pkg | Lighting pkg | Park distance control | Anti-theft alarm system

Last edited by adhrp; 09-17-2019 at 12:13 PM.
Reply With Quote
  #3  
Old 09-17-2019, 12:40 PM
namelessman namelessman is offline
Officially Welcomed to the 'Fest
Location: northern california
 
Join Date: Dec 2004
Posts: 11,986
Mein Auto: bimmer
Quote:
Originally Posted by adhrp View Post
Someone on the other forum reported their 335i has well over 100k miles and they haven't changed their spark plugs. So certainly seems possible, but not recommended.

See this thread starting post #65 onwards: https://f30.bimmerpost.com/forums/sh...1512602&page=3
Hmm NGK says OE laser iridium like BMW's should last 80k-100k miles. The normal irdium is 60k-80k interval.

The page does say "normal engine", so maybe a turbo engine does cut the interval in half.

https://www.ngk.com/learning-center/...ium-plugs-last

Last edited by namelessman; 09-17-2019 at 12:52 PM.
Reply With Quote
Sponsored Links
Advertisement
 
  #4  
Old 09-17-2019, 03:32 PM
adhrp adhrp is offline
Officially Welcomed to the 'Fest
Location: US
 
Join Date: Feb 2014
Posts: 635
Mein Auto: 2012 F30 328i
Quote:
Originally Posted by namelessman View Post
Hmm NGK says OE laser iridium like BMW's should last 80k-100k miles. The normal irdium is 60k-80k interval.

The page does say "normal engine", so maybe a turbo engine does cut the interval in half.

https://www.ngk.com/learning-center/...ium-plugs-last
I am going 80-100k on the next one. Mine actually looked really good (better than the pic you referenced) at 60k, so I thought it was a waste of a good set of plugs.
__________________


2012 328i Luxury Line | Glacier Silver/Saddle Brown | Premium pkg | Tech pkg | Cold weather pkg | Lighting pkg | Park distance control | Anti-theft alarm system
Reply With Quote
  #5  
Old 09-17-2019, 03:50 PM
namelessman namelessman is offline
Officially Welcomed to the 'Fest
Location: northern california
 
Join Date: Dec 2004
Posts: 11,986
Mein Auto: bimmer
Quote:
Originally Posted by adhrp View Post
I am going 80-100k on the next one. Mine actually looked really good (better than the pic you referenced) at 60k, so I thought it was a waste of a good set of plugs.
Mine do not have carbon deposit at ceramic part around the center cathodes, and the ground cathodes have gray coating burnt in but no carbon. The center tip and the metal square on the ground have white deposit, which may mean there is some wearing.

My thinking now is that 75k should be a good mileage to swap, as the replacement plugs should last till 150k miles(end of PZEV warranty).

Having said that, the ignition coils are covered under 15 years/150k miles of emission warranty, not changing @60k per service manual can give BMWNA an excuse to deny repair.

Last edited by namelessman; 09-17-2019 at 03:53 PM.
Reply With Quote
  #6  
Old 09-19-2019, 12:55 AM
namelessman namelessman is offline
Officially Welcomed to the 'Fest
Location: northern california
 
Join Date: Dec 2004
Posts: 11,986
Mein Auto: bimmer
Looking at my gas mileage for the last 10k miles with the new plugs, it looks like the mpg is 5-10% improved.

So let's say the old plugs can last another 20k miles(till 80k miles), with 5% worse mpg than new ones.

At 25mpg, 20k miles need 800 gallons, and a 5% improvement in mpg saves 40 gallons.

At $3.5/gallon, that can be $140 savings and pay for the plugs(and indy labor too)! Does that sound right?
Reply With Quote
Reply

See More Related BMW Stories


Forum Navigation
Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 3 Series & 4 Series > F30 / F31 / F32 / F33 / F34 / F36 (2012 - current)
Today's Posts Search
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On



Forum Jump


All times are GMT -7. The time now is 02:08 AM.


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
© 2001- VerticalScope Inc. All rights reserved.