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      05-21-2018, 08:49 AM   #1
Flyboy161
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Spark plug change question

Back story- So I bought an '08 M3 with 29,000 miles on the clock. Love it, but I took it back to the dealer and asked for the service records since it's out of warranty. They happily obliged along with key data that shows Service Data (CBS). It shows among other things rear diff service and spark plug change remaining distance 14k miles.

My thought process: I'm more of an old school gear head and while I am not against CBS, I still like to perform preventative maintenance based on mileage. So I researched and studied and came up with a happy medium for me. According to the Service and Warranty book spark plugs should be changed at 37,500 miles (not 44,000 miles). I found mention of 30,000 miles somewhere in here and in several shops recommendations. So oil change every 5k. Air filter and cabin filter every 15k. Rear diff fluid, spark plugs every 30k. I perform the vehicle inspection at every 5k so, that encompasses everything else.

So what's the point? While running INPA, I went into Functional Jobs, Condition Based Service, Status, Read Data: it shows spark plugs 61% (remaining?). Clearly the key data shows service life remaining and can thus be reset (I'll assume dealer only option, unless one owns the key reader). But I can't find a reset option in INPA.

THE QUESTION: Does anyone know of a way to "register" diff fluid change and spark plug change, air and cabin filter changes for the home mechanic or should I just suck it up and have the dealer write this info to the key? My SA did offer to reset things as needed, but they are about 40 miles away, so there's that. My ISTA-D will not write service history to the ECU but does show the jobs as completed using the built in TIS.
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      05-21-2018, 08:51 AM   #2
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Oh yeah, and based on service history, last oil change happened within a 1000 miles ago, so I performed my 15k and 30 k service minus the oil change.

*edit* I am glad I did the spark plug change as the right bank of plugs were not torqued. Nowhere in the service history has there been a spark plug change on the car.

Last edited by Flyboy161; 05-21-2018 at 09:06 AM. Reason: Added info
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      05-22-2018, 02:57 AM   #3
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everything you have found is accurate. you're on the mark.

while there may be some internal CBS system to note things like diff oil changes, but as you're already aware, its not displayed on the idrive system.
i had to show a service advisor at the dealer the specific literature (on the bmwusa website) stating that m3 plugs are due at 37,500 mile intervals, not the third service like the 1m (which would put the mileage at 55k, following 15k oil service intervals).
they still bellyached about it, but did it.

i'm probably going to do my diff oil about every 30k-ish. i track the car, so i want to be conservative on the intervals. just do both services and make a mental note of the mileage.
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      05-22-2018, 06:10 AM   #4
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Thanks, I like doing sanity checks occasionally. I'll pull INPA up now that it's post spark plug change and see if it reads any different on the percentage of spark plug life remaining. With regards to ISTA-D, it won't write to the modules, but ISTA-P will. I'm going to have to dig some more on that note.
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      05-23-2018, 09:31 AM   #5
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Quote:
Originally Posted by Flyboy161 View Post
Thanks, I like doing sanity checks occasionally. I'll pull INPA up now that it's post spark plug change and see if it reads any different on the percentage of spark plug life remaining. With regards to ISTA-D, it won't write to the modules, but ISTA-P will. I'm going to have to dig some more on that note.
AFAIK the ECU has no way to determine how worn the plugs are, hence the fixed interval of 37k.
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      05-31-2018, 05:32 PM   #6
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which spark plugs did you use?

sorry for such a noob question
just got my e90m3 so i'm starting from scratch

car has 58k miles
thinking of replacing motor mounts and spark plugs while replacing rod bearings all at once
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      05-31-2018, 08:00 PM   #7
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which spark plugs did you use?

sorry for such a noob question
just got my e90m3 so i'm starting from scratch

car has 58k miles
thinking of replacing motor mounts and spark plugs while replacing rod bearings all at once

NGK LKR8AP is the factory plug. BMW part #12120032273.
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