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      10-06-2009, 12:03 PM   #1
dude500
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Condition Based Service? Real?

Backstory: I had the oil changed under the annual oil change service, at 13k, and the oil service mileage hadn't been reset at the time, so it was indicating about 1.5k miles left. I went to my dealer this past weekend to get a brake light replaced under warranty. I found out that my SA had taken the liberty to reset my oil service mileage to 15k miles left and 10/2011 (two years from now...) under the Service-Info menu.

I told my SA that if I follow the current Service-Info schedule, I would be 2k miles or one year overdue when the car would tell me to come in. He said that the Service-Info is just to keep me aware of the 15k or one year change, and that I should come in at 28k or 10/2010. I then told him that I thought the service interval indicated would change depending on how I drive the car, and he basically said that is wrong - the car is just telling me the normal oil change schedule of 15k/1 year.

So my questions are: can I really trust what the car is telling me on when I need to bring it in for service? Do my brake pads only have 5k life left instead of the 38k indicated? It just seems like I'd have a false sense of security based on what the car is telling me.
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      10-06-2009, 12:23 PM   #2
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Quote:
Originally Posted by dude500 View Post
Backstory: I had the oil changed under the annual oil change service, at 13k, and the oil service mileage hadn't been reset at the time, so it was indicating about 1.5k miles left. I went to my dealer this past weekend to get a brake light replaced under warranty. I found out that my SA had taken the liberty to reset my oil service mileage to 15k miles left and 10/2011 (two years from now...) under the Service-Info menu.

I told my SA that if I follow the current Service-Info schedule, I would be 2k miles or one year overdue when the car would tell me to come in. He said that the Service-Info is just to keep me aware of the 15k or one year change, and that I should come in at 28k or 10/2010. I then told him that I thought the service interval indicated would change depending on how I drive the car, and he basically said that is wrong - the car is just telling me the normal oil change schedule of 15k/1 year.

So my questions are: can I really trust what the car is telling me on when I need to bring it in for service? Do my brake pads only have 5k life left instead of the 38k indicated? It just seems like I'd have a false sense of security based on what the car is telling me.
I think your service guy gave you accurate info. As far as I know, the oil service recommendation from the software is only mileage based. It has nothing to do with how hard you drive the car.

Regarding brakes... I would trust the iDrive. The brake indicator is a wear item. It wears down at the same rate as the actual brake pads. When the indicator is at zero thickness, so is the brake pad. In the absence of some wierd scenario, trust the brake info. Also, you can always peek through the spokes and confirm the presence of lots of pad material.
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      10-06-2009, 12:28 PM   #3
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Quote:
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I found out that my SA had taken the liberty to reset my oil service mileage to 15k miles left and 10/2011 (two years from now...) under the Service-Info menu.
After the annual low mileage oil change, your SA/BMW Tech isn't supposed to reset the service indicator. I've had two low mileage annual oil changes so far and they have not reset the service minder. my most recent one was last month and now I will be getting the regular oil change in 6000 miles when they will reset the service minder.

Here's a thread that talks about not resetting after annual oil change: http://www.e90post.com/forums/showth...age+oil+change

Last edited by rambalu80; 10-06-2009 at 12:32 PM. Reason: added link
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      10-06-2009, 01:22 PM   #4
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Here's a thread that talks about not resetting after annual oil change: http://www.e90post.com/forums/showth...age+oil+change
Thanks for the link. Didn't know that was a bigger issue haha. Also I didn't know that the oil change is mileage/age based while the brakes are actually checked by the car.

So my follow on question is: which of the service indicators are truly condition based and which ones mileage/age based?

Now that you told me that the oil change indicator is not condition based, I feel like I need to change it more often haha.
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      10-06-2009, 01:33 PM   #5
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They are all claimed to be condition based. However, I will just use this after my warranty expires, starts on page 4: http://www.bavauto.com/newsletter/20...newsletter.pdf
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      10-06-2009, 01:35 PM   #6
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I don't know of any sensor that does a "quality" check. All the sensors do a "level" check. Even the brake sensor acts like the float sensors in the brake fluid, coolant, and wash fluid reservoirs.

I would change oil more frequently than they recommended. Spend your money as you see fit as opinions vary.
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      10-06-2009, 02:41 PM   #7
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They are all claimed to be condition based. However, I will just use this after my warranty expires, starts on page 4: http://www.bavauto.com/newsletter/20...newsletter.pdf
nice, thanks!
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      10-07-2009, 01:08 PM   #8
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The recently released Bently Service Manual has a really good write up on how the oil level/oil condition sensor works. The sensor electrically measures the condition of the oil.
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      10-07-2009, 03:47 PM   #9
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^^^ So, long story short, he should not have messed with the service indicator.
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      10-07-2009, 04:07 PM   #10
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The recently released Bently Service Manual has a really good write up on how the oil level/oil condition sensor works. The sensor electrically measures the condition of the oil.
HMMM. Now I am confused again. So, the car does check the quality of the oil? If so, why does there even need to be a reset?

Or do you mean "condition" as in "level"?
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      10-08-2009, 06:09 PM   #11
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HMMM. Now I am confused again. So, the car does check the quality of the oil? If so, why does there even need to be a reset?

Or do you mean "condition" as in "level"?
Condition as in "the oil is not dirty enough to require a change". The system uses several factors to determine the oil condition, one of them is testing the electrical properties of the oil, the others are mileage and MPG based. Since it is mileage based you need to reset the monitor to start counting mileage once the engine is filled with new oil.
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      10-08-2009, 06:39 PM   #12
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I find the oil condition sensor to be bogus. I've done 2 oil changes already and the interval it tells me has NEVER changed. It still says 15k. I changed oil at 7k and it STILL said 15k for the first one. I changed it AGAIN at 10k and guess what the service interval told me? 15k.......

If it really monitored the oil, I would have seen SOME fluctuation.
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      10-09-2009, 08:09 AM   #13
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The oil condition monitor can not tell if new oil is added to the engine. It's parameters are either the oil is good, or it is bad. It doesn't measure how good the oil is or how close it is to being bad.

If you are changing oil at 7,000 mile intervals then ignore the CBS; it is not doing you any good to pay attention to it. The CBS is designed to tell you when the oil needs changing. BMW has determined that 15,000 to 18,000 miles is the change interval using their OEM filter and oil. The CBS determines when to change the oil within those mileages.

It's simple; either you trust the CBS, or you don't. Either you change the oil at the CBS indicated mileage, or you do it sooner.
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