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Old 11-26-2019, 12:40 PM   #21
Alex323Ci
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Oil is cheap and easy to replace, so I dunno why you would be changing it per what the car says.
1) because the whole reason “per what the car says” is calculated by the engineers so you can know when. any other number is basically arbitrary.
2) just because one can easily blow money doesn’t mean one should
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Old 11-26-2019, 12:58 PM   #22
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2) just because one can easily blow money doesn’t mean one should
...unless you're a weirdo (like me) who actually enjoys changing his car's oil, in which case it's as much "blow[ing] money" as it would be to spend it on anything else frivolous, like, say, a high-maintenance older German sports sedan vs. a Camry.

And to those who make the argument that frequent changes aren't environmentally-friendly, every drop that comes out of the engine is recyclable.
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Old 11-26-2019, 01:01 PM   #23
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I love the bmw engineers!

Anyway, I'll mention something I'd read a long time ago here...that oil will leave a film on your metal, which film is an additional barrier to protect your engine. If you change too often with detergent oils, you'll remove this film.

Oil gets dark from hydrocarbons...the filter picks up particulate matter...so 'dirty' oil doesn't mean it's bad...it could actually be good for you.
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Old 11-26-2019, 06:19 PM   #24
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5000mi intervals with mobile one 10-40 along with filter. if it goes to 6000 im not stressing but anything past that eventually you will get buildup from the vapors that break down and collect
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Old 11-26-2019, 07:10 PM   #25
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I do 5k, 7500 max intervals. Depends a lot on driving style, if you do a lot of highway, yeah pushing 7500-10,000 is probably alright, if you touch redline a lot though and are doing a lot of city driving, i'd say stick to 7500 and lower for OCI.
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Old 11-27-2019, 01:26 PM   #26
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Been doing 10K OCIs using Mobil 1 and a good filter on all my vehicles since that oil came out (late 1980's?)

Everything from a 4 cyl. Hyundai Excel (remember those?) and a tiny Chevy Spark to a big-block Suburban to 6 cyl. Chrysler minivans, Ford sedans and now including my 2003 330cic vert.

10K, Mobil 1 and good quality filter. Check level every 3K or so and top off if needed.

All previous vehicles hit 200+ K miles w/o a single internal engine issue (still got the Spark @ 100K, the Burb @ 210K, and the e46 is @ 136K...)

IMO no need to change sooner unless you race your vehicle.
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