I have been told that Honda does not recommend flushing out either the transmission oil or the cooling system fluid. Just replace what gravitationally flows from an open drain valve. Is this true? The car is manual shift, has 140,000 miles and never had either of these services performed.
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1997 Honda Civic Question: transmission oil and cooling system flushing
Answer #1matte April 21, 2009, 20:06Master
This is absolutely true. Honda does not recommend using flushing machines on any of its vehicles or any of its components.
patrick mannion from Greg Solow's Engine Room, April 22, 2009, 01:20Master
I agree with Matt.
Anyway there is nothing to be gained from trying to flush a manual transmission, it is mechanically configured different from an automatic transmission and changing the transmission oil when the car has been driven to get the oil hot will get a sufficient amount of oil out of the transmission.
Replyhatch, April 22, 2009, 10:50Rookie
Thanks to both matt and autotechpat for their quick responses. I'll proceed on the basis of their answers.