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Old 05-20-2019, 09:51 PM
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Dave 20T Dave 20T is offline
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Location: Western Washington state
Join Date: Apr 2013
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Mein Auto: 320i (F30)
Originally Posted by chris.luurtsema View Post
I keep noticing during startup that the next service is in 9000 miles.
(oil is the next service due in the menu list this followed by a service check in 27k)

I have put about 1300 miles on the car since the oil change and the monitor has not reflected a change from the 9000 initial count down. Is this normal?
It is normal. What seems to happen is that it stays at a high number, say 9000 miles, for a long time. Then it drops to 8000 miles or so. When it is around 2000 miles, it drops like a rock.

In other words, slow countdown at first, then speeds up too fast.

Originally Posted by Wolfus Aurelius View Post
Which reminds me to ask: How does BMW's computer figure the OCI? Is it by algorithm based on cold starts, city vs. highway driving, temps during short trips, etc. -- or does it actually test the oil?
There is no chemistry lab in the engine compartment. It's not even resistance to electrical current or how well a float floats up.

I believe, but am not certain, that after 2000 liters of gas (about 500 gallons) is used, the oil life monitor indicates it's time to change oil. So a lot of cold weather, short trips will use up gas and result in a lower oil change interval. A moderate temperature and 100% long highway trips will have good fuel economy and a long oil change interval to 500 gallons.
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