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How our service reminder countdown ACTUALLY works
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02-24-2006, 06:26 AM | #1 |
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How our service reminder countdown ACTUALLY works
From BMW TSB B12 25 05
CBS4 was first introduced with the E90 and it differs from the previous CBS2 and CBS3 systems in regards to how the "Engine Oil Service" is calculated. The CBS4 starting point, of 25,000 km or 15,534 miles for engine oil, is initiated during the PDI - QC1 Handover Inspection with the entry of the "Date of Registration" or after a CBS reset. The Instrument Cluster will round up this data value sent from the DME and begin with a display of 16,000 miles. The countdown until "Service Due" for engine oil is based primarily on the fuel consumption value as calculated by the DME. The CBS4 algorithm in the DME uses the following fuel consumption averages to achieve the 15,534 target oil service mileage. N52 with automatic transmission = 21.4 mpg N52 with manual transmission = 21.7 mpg Actual fuel consumption above or below these averages may increase or decrease the target service mileage accordingly. The displayed mileage until service is due, beginning at 16,000 miles, will decrease in 1000 mile increments until approximately 5000 miles remain. It then decreases in 100 mile increments until 500 miles remain, and finally in 10 mile increments until due. |
02-24-2006, 08:28 AM | #3 | |
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What if the DME resets or clears? If you unhooked the battery for long enough in some cars it would reset the DME!, Is it possible to reset the DME? and is that in the instrument cluster? Reason why i ask is I have a reletive that will need a new cluster on his e90 ( because of a botched gage mod) and I was just curious ... Any ideas? Thanx
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02-24-2006, 08:55 AM | #4 |
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very interesting, thanks!
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02-24-2006, 08:57 AM | #5 | |
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When they put in the new cluster his milage on the new cluster will be updated by the other 2 locations.
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02-24-2006, 08:58 AM | #6 |
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That TSB doesnt talk about the oil quality sensors that can also change the service interval
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02-24-2006, 09:13 AM | #7 |
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Very good thread! Thanks for the information. I know that the service interval is based upon the way the car is driven but it's interesting to know more about it. I drive all highway in the sedan and get 30 mpg on average, so my interval is way up there.
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02-24-2006, 10:28 PM | #8 |
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Interesting info.
IIRC from old threads on bimmerfest.com, the E46 counts down from 666 gallons of gas consumed to the next oil change.
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02-24-2006, 11:10 PM | #9 |
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Wow...nice that explains it.
My countdown is now at 10,000. I do drive alot in general. But my weekdays are loaded with stop/go driving in LA....crap!
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03-11-2006, 06:48 PM | #10 | |
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03-11-2006, 07:17 PM | #11 | |
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03-11-2006, 07:55 PM | #12 |
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Hi DJRobb,
I am beginning to see that pattern emerging. Thanks.
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03-11-2006, 08:28 PM | #13 |
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Does anyone actually drive the car until 25,000kms before changing the oil???
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03-12-2006, 01:05 PM | #14 | |
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03-12-2006, 01:37 PM | #15 | |
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yeah, I'm almost 16 thousand miles in oil won't get changed for about another 4K |
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03-13-2006, 12:58 AM | #17 | |
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03-13-2006, 10:04 AM | #19 |
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Great info. I will try to get an oil change this week. I just passed the 8000 mark. About halfway how between when I will get my free oil change.
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03-13-2006, 11:41 AM | #20 |
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I have a question about the US free scheduled maintenance.
Is it covered by indicator mileage only, or a combination of 1 year and indicator mileage which ever comes first? |
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03-13-2006, 12:25 PM | #21 | |
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03-13-2006, 04:40 PM | #22 |
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Finally!! Someone posts some worth-while information on this forum. That's the kind of stuff we want here. It gets a bit old seeing the SAME silly posts on here about 'automatics vs manuals', 'IS350 vs 330', 'this kid at school keeps picking on me because I own an E90', yada yada yada....
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