Q: my mother was told today she needs her transmission flushed oil is to dirty on 2006 Buick Lucerne

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I was told this could be a good thing or bad thing the car has 81,000 miles on it and not sure if she has had this done before what does it mean that this could be a good thing or bad thing. and her check tire persure light keeps comimg on but the tires are fine
(1) Answer
81k is not too many miles to have the transmission flushed, if it was say 150, I would hold off, because by then there is usually too much wear on the valve body by the dirty fluid and a flush, in some cases, can hurt the transmission. As for the tires, it is most likely a bad tire pressure monitoring valve in one of the tires that keeps setting the TPMS light. A good scan tool ( not a parts store type ) will be able to sort out which valve it is.
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