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      01-11-2023, 11:40 AM   #1
97blksvt
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Advice on long oil change interval for possible purchase

Looking at buying a 2017 M3 from down south with about 90k on it, lots of maintenance records but there is a period where it looks to be a 12k mileage and 10k mileage before it was changed. This was early on in the life of the vehicle. It has had the break-in change done at 12xx miles which is great and besides those two oil changes everything else has been every 6-7500 miles.

I'm new to M series so figured it seek the advice of those who own them, Iv had a few E46 3 series and been around these forums back in the day so not new to the brand just looking for some solid advice.

Thanks in advance.
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      01-11-2023, 12:00 PM   #2
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I think a couple times of changing the oil at the manufacturer recommended interval did not damage anything.
Best practice on any bmw is 6k or so, but that's a best practice and provides max longevity

Overall the f8x cars are very solid cars
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      01-11-2023, 01:13 PM   #3
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I’ve done thousands of oil changes on F8x platform. Max out at every 5k Miles. The more often the better. Since I’m a mechanic myself I do mine every 2k but it’s overkill. Only Oil you should ever use is Castrol Euro, Amsoil Euro, redline or Motul 5w-40 in hot climate and 0w-40 in freezing climate
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      01-18-2023, 09:19 AM   #4
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Thank you guys, appreciate the input and advice.
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      06-11-2023, 08:11 AM   #5
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Quote:
Originally Posted by 97blksvt View Post
Looking at buying a 2017 M3 from down south with about 90k on it, lots of maintenance records but there is a period where it looks to be a 12k mileage and 10k mileage before it was changed. This was early on in the life of the vehicle. It has had the break-in change done at 12xx miles which is great and besides those two oil changes everything else has been every 6-7500 miles.

I'm new to M series so figured it seek the advice of those who own them, Iv had a few E46 3 series and been around these forums back in the day so not new to the brand just looking for some solid advice.

Thanks in advance.
The majority of lubrication related engine wear occurs on cold start, in reality these obsessions over a few thousand miles plus or minus are irrelevant.
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      06-27-2023, 10:59 PM   #6
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Might of been during the free maintenance plan as the dealership will only change it when the CBS light is on. I think it's 10K miles by default.
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      06-28-2023, 08:39 AM   #7
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Thanks everyone, I did in fact buy the vehicle and have been driving it since late February and loving it.
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      06-29-2023, 07:14 PM   #8
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If you are driving in the city a lot, stick to 3K miles interval.
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      07-07-2023, 02:23 AM   #9
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Quote:
Originally Posted by kyrix1st View Post
If you are driving in the city a lot, stick to 3K miles interval.
I think that’s way too short for an oil interval even for mostly city driving. I drive in a lot of stop and go and my CBS still recommends 10K miles for an oil change.
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      07-08-2023, 12:35 PM   #10
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Quote:
Originally Posted by N1rve View Post
I think that’s way too short for an oil interval even for mostly city driving. I drive in a lot of stop and go and my CBS still recommends 10K miles for an oil change.
Do what you want with your car, oxidation kills engine oil that doesn't get up to temp i.e. city driving. Has less to do with mileage, more to do with engine's operating hours. I stick with 2-3K/1 year because I redline frequently, and that's how I've maintained all my Ms for the past decade.

I can also tell you from city driving my whole life, I've seen too many high strung engines having trouble with OCI over 10k km( 6k miles).
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      07-09-2023, 02:10 AM   #11
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Quote:
Originally Posted by kyrix1st View Post
Do what you want with your car, oxidation kills engine oil that doesn't get up to temp i.e. city driving. Has less to do with mileage, more to do with engine's operating hours. I stick with 2-3K/1 year because I redline frequently, and that's how I've maintained all my Ms for the past decade.

I can also tell you from city driving my whole life, I've seen too many high strung engines having trouble with OCI over 10k km( 6k miles).
That's what CBS is for...Condition Based Service. Hence the "conditions" of your driving?
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      07-10-2023, 08:09 PM   #12
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Quote:
Originally Posted by N1rve View Post
That's what CBS is for...Condition Based Service. Hence the "conditions" of your driving?
I'm saying your CBS is very lenient because it has to meet certain environmental regulations, and no oil sensor can detect the loss of HTHS and/or detergents (in ppm). It merely reads oxidation level.

My E92 M3 CBS states 25,000km left on every OCI and drops mileage from that, regardless of whether I've had 10 track days or none. This is a further proof that the oil sensor merely reads oxidation, which happens very slowly for cars that are always up to operating temp to burn off excess moisture. You have to use your sound judgment to see which OCI makes more sense.
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      07-17-2023, 12:12 AM   #13
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Get an oil analysis and add on TAN and you’ll have your answer on best interval. I personally run 3k intervals MAX since I’m on flex fuel and E85 kills oil due to fuel dilution and oxidation.
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      08-01-2023, 08:44 AM   #14
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Quote:
Originally Posted by hellokitty View Post
Get an oil analysis and add on TAN and you’ll have your answer on best interval. I personally run 3k intervals MAX since I’m on flex fuel and E85 kills oil due to fuel dilution and oxidation.

Who do you oil analysis thru and what's TAN add on? Im on e85 as well for the summer or some kind of blend of it.
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      08-01-2023, 08:47 AM   #15
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Quote:
Originally Posted by 97blksvt View Post
Who do you oil analysis thru and what's TAN add on? Im on e85 as well for the summer or some kind of blend of it.
Blackstone is the benchmark for oil analysis.

https://www.chevronlubricants.com/en...n-vs-tan.html#
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      08-01-2023, 09:00 AM   #16
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Quote:
Originally Posted by hellokitty View Post
Blackstone is the benchmark for oil analysis.

https://www.chevronlubricants.com/en...n-vs-tan.html#
Thank you very much.
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      08-10-2023, 05:47 PM   #17
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Did my first oil change and this is what I get, drain plug pretty loose, bunch of metal threads which I assume is a terrible helicoil job. Test out drain plug definitely stripped and won’t tighten all the way.

BMW fam what are my options here aside replacing the pan.
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      08-10-2023, 07:22 PM   #18
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Replace the oil pan.
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