I just got a 85 325 e a little but ago and the inspection light was on
but today it turned off and the oil service light came on. I checked
my manual but it only tells how to install and take it out it doesn’t
give me a reason why it turns on. i am running 10w-40 (its what the
book recomended) and this oil doesn’t have more then 300 miles on it.
Any one have any idea ???
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This is supposed to be based on time and engine load, but in an '85 the
battery's in the cluster are likely shot and it's just being erratic.
They are nicad batteries soldered to the rear of the cluster.
The Service Interval and the Oil Service indicators come on as a result of a
timer - for lack of a better term. When the service is performed, the timer
is reset by the technician. If the timer is not reset, then the car won't
know the service was done and the light will come on at its scheduled
interval even if the service was recently done.
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