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Old 07-03-2021, 12:18 PM   #1
FC
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M3 sparkplugs after 3 years?

Dropped off the F80 for its final free oil change and was told it was due for a break fluid flush, cabin air filter, and spark plugs.

The car is 3 years old with 10,552 miles.

It's all free, which is great, but the plug service surprised me.
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Old 07-03-2021, 12:57 PM   #2
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Yeah - I would have expected the plugs to be more of a mileage thing than a time thing... or whatever happened here....

Oh well, free is free.
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Old 07-03-2021, 01:04 PM   #3
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I always go by the manufacturer’s recommendation, what does the manual say ? I know in my 911 I had the spark plugs changed at probably around the close to that mileage but I think Porsche recommended it at the 5 year service …

Sometimes I look back and can’t believe the amount of maintenance I put into that car due to age rather then mileage.
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Old 07-03-2021, 01:41 PM   #4
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Plugs are every four years on the 987, regardless of mileage. Looks like the S55 M3 interval is indeed every 3 years.
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Old 07-03-2021, 09:12 PM   #5
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On the S65, BMW was using the spark plugs for knock detection. So spark plug condition is absolutely critical. Maybe the S55 is also doing that?
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Old 07-04-2021, 12:51 PM   #6
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Nope. Looks like they went back to knock sensors on the S55. I wonder what the reasoning was?
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Old 07-04-2021, 05:23 PM   #7
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Quote:
Originally Posted by Nick M3 View Post
I wonder what the reasoning was?
Dealerships make most of their money from service?
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Old 07-04-2021, 08:56 PM   #8
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Quote:
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Dealerships make most of their money from service?
I wouldn’t be surprised if the S55 eats plugs in other ways.

Run plugs too long in an S65, and it’ll cost you 30-40hp.
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Old 07-05-2021, 12:13 AM   #9
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Quote:
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I wouldnít be surprised if the S55 eats plugs in other ways.

Run plugs too long in an S65, and itíll cost you 30-40hp.
Wow, thatís crazy!
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