140k Miles, still on OEM Plugs!

rollingSquare · 05-13-2023, 03:19 PM

So looking through the maintenance files of the F15, it looks like there was a seriously glaring oversight on spark plug changes, as in, they have never been changed once. Everything else: oil, filters, brakes, etc have been followed to the T.

Oddly enough, the N55 hasn’t had any issues, leaks, misfires, or notice effect on power or MPG.

So just wanted to show you guys what 140k miles looks like on the original set:

-two of the spark plugs had blackened center electrodes
-there is a noticeable grayish powdered substance and black/brown residue collected on the surfaces

But, the insulators hasn’t cracked and all the gaps I measured to be at .035

rollingSquare · 05-13-2023, 03:27 PM

The ignition coils also looked brand new, zero corrosion.

F15_SGM · 05-13-2023, 04:37 PM

Quote:

Originally Posted by rollingSquare

The ignition coils also looked brand new, zero corrosion.

The only way to find oil leaks on n55 is on a lift due to the oil being soaked into the bottom tray hidden. No f15 n55 oil leak will drop on the floor. As for the ignition coils, you won't be able to tell if they're good or bad visibly they just electronically start to go bad. Mine were new looking as well, but after I changed plugs, they shortly failed after. Save the money and replace them now. you don't want to be stranded from a coil misfiring later randomly.

Tomcat_F15_STL · 05-13-2023, 09:27 PM

Outstanding. Thanks for sharing!

imr3n · 05-15-2023, 01:40 PM

that is insane! never heard of anyone doing 140k on the original plugs on a f15

rok2774 · 05-15-2023, 01:57 PM

awesome. thanks for sharing... i don't feel as guilty waiting till 60K miles to change mine then.

Kurzgesagt · 05-15-2023, 02:27 PM

Quote:

Originally Posted by imr3n

that is insane! never heard of anyone doing 140k on the original plugs on a f15

Sad to say - never thought of it until now... 2016 BMW X5 w/ 160k miles, haven't replaced the spark plugs...

yupetc · 05-16-2023, 10:58 AM

I've wasted at least 6 sets of spark plugs then. LOL. Thanks for sharing.

rollingSquare · 05-16-2023, 02:22 PM

Just to be clear, I’m an idiot. I would’ve done it if I had remembered, but for some reason I just never did.

I am in no way shape or form advocating doing extended mileage on anything, even oil.

05-13-2023, 03:19 PM	#1
rollingSquare New Member 1 Rep 18 Posts Drives: 2016 F15 X5 N55 3.0 Join Date: Feb 2023 Location: CA iTrader: (0)	140k Miles, still on OEM Plugs! So looking through the maintenance files of the F15, it looks like there was a seriously glaring oversight on spark plug changes, as in, they have never been changed once. Everything else: oil, filters, brakes, etc have been followed to the T. Oddly enough, the N55 hasn’t had any issues, leaks, misfires, or notice effect on power or MPG. So just wanted to show you guys what 140k miles looks like on the original set: -two of the spark plugs had blackened center electrodes -there is a noticeable grayish powdered substance and black/brown residue collected on the surfaces But, the insulators hasn’t cracked and all the gaps I measured to be at .035 Attached Images
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05-13-2023, 03:27 PM	#2
rollingSquare New Member 1 Rep 18 Posts Drives: 2016 F15 X5 N55 3.0 Join Date: Feb 2023 Location: CA iTrader: (0)	The ignition coils also looked brand new, zero corrosion. Attached Images
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05-13-2023, 09:27 PM	#4
Tomcat_F15_STL First Lieutenant 150 Rep 349 Posts Drives: BMW F15 Join Date: Nov 2021 Location: St. Louis iTrader: (0)	Outstanding. Thanks for sharing!
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05-15-2023, 01:40 PM	#5
imr3n Private First Class 43 Rep 105 Posts Drives: BMW X5 2014 Join Date: Nov 2022 Location: Bay Area iTrader: (2)	that is insane! never heard of anyone doing 140k on the original plugs on a f15
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05-15-2023, 01:57 PM	#6
rok2774 Private First Class 36 Rep 108 Posts Drives: X5 Join Date: Aug 2014 Location: NE iTrader: (0)	awesome. thanks for sharing... i don't feel as guilty waiting till 60K miles to change mine then.
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		BMW X5 and X6 Forum (F15/F16) > BMW X5 (F15) and BMW X6 (F16) Forum > BMW X5 and X6 (F15/F16) Forum
140k Miles, still on OEM Plugs!

05-16-2023, 10:58 AM	#8
yupetc Captain 390 Rep 661 Posts Drives: 2015 X535i Join Date: Feb 2013 Location: Houston, TX iTrader: (0)	I've wasted at least 6 sets of spark plugs then. LOL. Thanks for sharing. __________________ 2015 X535i - CP Piston, Manley Rod, ACL/King bearings, MILVs VRSF full charge Pipe, Wagner FMIC, Hybrid Turbo, MHD2+ VRSF DP, UR Front/Rear Sway Bars, Eibach springs, Bilstein B6 2015 MINI COOPER - Mahle Pistons, Max Rods, BMS intake, CTS charge pipe, Wagner Intercooler, ByteTronik Tune, VRSF DP 2017 540i - MHD2+, VRSF DP, TU Pump
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05-16-2023, 02:22 PM	#9
rollingSquare New Member 1 Rep 18 Posts Drives: 2016 F15 X5 N55 3.0 Join Date: Feb 2023 Location: CA iTrader: (0)	Just to be clear, I’m an idiot. I would’ve done it if I had remembered, but for some reason I just never did. I am in no way shape or form advocating doing extended mileage on anything, even oil.
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