I've been trying for a long time with a full drain and fill on a 2007 Honda Odyssey. I had such a problem - switching from the first to the second on cold. I drained and refilled the original fluid and then added Lubegard - the results weren't immediately obvious, it took about 5,000 miles for the fluid to run through the system and the gear shifting was much better. This was the last thing to try before installing a used gearbox on a car. So I tried this friction modifier and it helped
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