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Absolutly not. Drain all the fluid out, replace the filter, and pour in fresh fluid. Do not flush this transmission. It has too many miles on it for a flush. You may stir up trouble with a flush. I would add a second filter from [http://emergingent.com/subpage1Magnefine.htm The Magnefine Filter System] as well.

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17y ago
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Q: Should you flush the transmission fluid if it has not been done yet 1999 Pontiac Sunfire 125000 miles?
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