FSS suddenly went from 5500 miles to 26 miles in one week? - Mercedes-Benz Forum

 
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post #1 of 8 (permalink) Old 03-11-2009, 06:59 PM Thread Starter
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FSS suddenly went from 5500 miles to 26 miles in one week?

I have three W210s. Two are driven regularly, either daily or every other day.

The third one is driven maybe once every couple of weeks, for appx 50 miles.
During the last year, it probably logged approximately 4500 miles(highway).
I still change the oil/filter every few months, despite putting on very little
miles on it. The last time I changed the oil was last month. Used the usual
Mobil 1 0W-40 and MB oil filter. At that time, the FSS showed 5500 miles
remaining, which I wrote down in the service booklet in the glove box.

This afternoon, I started it up and the FSS immediately came on and showed
26 miles remaning. I was like... what the... ??? In one month's time with
maybe 100 miles, it dropped more than 5000 miles? The car's battery was
never disconnected. In fact, last week, I did change the clock in the car.
(without starting it up) The clock is still showing the correct time.

I turned off the engine and checked the oil. It was at the half mark on the
dipstick, and the oil looked very clear.(since it was only poured in a month
ago and driven 100 miles)

Does anybody know what could have caused this? Should I drive it to the
dealer and have the check it out?

Thanks!
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post #2 of 8 (permalink) Old 03-11-2009, 11:54 PM
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This does sound odd. Removing the battery should not affect FSS in any case. I understand that FSS counts more or less miles than actually driven, according to several criteria but it should be doing it rather smoothly, unless it changes from "miles to next service" to "days to next service" which is a totally different thing.

I typically add a litre of oil somewhere at 20 000 km from the previous oil change and on all my FSS cars the service reminder makes a jump some time after this, but obviously miles to next service gets increased when the oil quality detector finds improved oil quality.

From one source of "known issues" I did not find anything like this. I doubt the dealer would find the cause either. Unless someone explains this, I assume it is just a SW glitch and the most you might consider is have the IC SW updated at next service.
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post #3 of 8 (permalink) Old 03-12-2009, 05:28 AM
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I think there is a sensor that measures something in the oil, like the quality.
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post #4 of 8 (permalink) Old 03-12-2009, 08:03 AM
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Quote:
Originally Posted by Peter Guenther View Post
I think there is a sensor that measures something in the oil, like the quality.
Yes, but the oil quality should not change "over night" that dramatically (to the worse). The sensor explains my example where FSS increases stepwise miles to service.
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post #5 of 8 (permalink) Old 03-12-2009, 09:03 AM Thread Starter
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Originally Posted by Diesel Benz View Post
Yes, but the oil quality should not change "over night" that dramatically (to the worse). The sensor explains my example where FSS increases stepwise miles to service.


that's what I was thinking... I changed the oil with Mobil 1 0W-40 only a month ago.
the oil was "fresh" in the cases when I bought them from the local Autozone.

Is there any chance that the Moil 1 may have been bad? (either during manufacturing,
or after being exposed to air when I opened them) If so, could it have cause the FSS
oil sensor to freak out and jump from 5000 to 26 in such a short time? Maybe it's just
the way the FSS robot is yelling "danger, Will Robinson, danger, bad oil!"

Another possibility that I'm thinking about is a possible bad FSS oil sensor? Where
is this sensor supposed to be located?

I'm actually thinking about replacing the oil again, just to see what happens...
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post #6 of 8 (permalink) Old 03-12-2009, 09:04 AM
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Quote:
Originally Posted by kathy_moore View Post
During the last year, it probably logged approximately 4500 miles(highway).
I still change the oil/filter every few months, despite putting on very little
miles on it.
Why are you changing the oil so often? Once a year should be fine. I almost wonder if the frequent changes are messing up the FSS somehow ...

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post #7 of 8 (permalink) Old 03-12-2009, 10:26 AM
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Quote:
Originally Posted by Mike Wevrick View Post
Why are you changing the oil so often? Once a year should be fine.
I did not want to say that although I agree completely. But FSS should not get confused, never know though.

I cannot see how the oil could be bad in such a way that FSS accepts it first and suddenly it would appear bad (unless there would be some water leak or a similar reason).

I did not look at the FSS sensor location, it is somewhere in the oil pan, low enough to measure low oil levels.
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post #8 of 8 (permalink) Old 03-12-2009, 02:55 PM
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Kathy: At this point, perhaps your best bet may be to draw a sample of the oil in the car and send it to a lab. You may find a decent Oil Analysis Lab in the Yellow Pages. It may set you at ease, or may indicate something wrong with the oil (quality problem or water leak). It may be the most economic approach, because if the oil is OK all you'd have to do is to reset the Service Reminder. IMPORTANT: The Mobil 1 you used, is it labeled MB229.3 or 229.5 (229.51 if diesel) approved?

Last edited by JoeVal; 03-12-2009 at 02:58 PM.
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