At the 100,000km mark I'll probebly be changing mine to Royal Purple Gear oil. That's only because I used it in my old WRX and find it hard not to use it again (even though Honda's MTF is quite good). Shifting improves 3 fold, and gear transitions/noise is cut by half. Also I would rather know that during the 50,000km service interval it still performance as close as possible to the day I put it in there. I used to change the Mineral Oil (MTF 06) in my integra every 15,000kms and everytime I noticed a quite noticable differance in shift smoothness. If a differance in transmission oil is noticable then the fluid deteroriated over a fairly short period of time too much for my liking.
MTF is probebly more than sufficient. My only advice, stay far away from Penrite Products including the synthetic. I used both their Mineral and Synthetic in about 4 differant Honda's and all ended up shifting hard and grinding/notching into third at anything above 4000rpm. Would not go near their products again. Expessially considering Honda MTF at almost a third of the price, performed better...
Edit, awful spelling
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