For my '97 Civic, I believe it's every 30,000 miles. This is for the manual
transmission. It is extremely easy to do. Honda recommends using their
fluid. I noticed a big difference in shifting when I changed mine at 100K.
Probably the first it had been done (I bought it used). You should replace
the crush washers. The lower one is the same size as the oil drain plug.
The upper one is larger and probably doesn't really need to be changed.
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