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Older Honda transmissions (up through the early 90s at least) don't like the synthetics so much. The owner's manual for my CRX calls for 10W40 motor oil in the transmission, believe it or not. I haven't checked the later ones, but I wouldn't be too surprised to find them spec'ed for the same thing.
Check on some of the Honda forums for posts by "Mister Bone" (or "Mista Bone"??); he's a D-series transmission guru, and IIRC he does not recommend synthetic lubricants for the Honda manual transmissions.
-soD
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