The synthetic seems to be cleaning my tranny as I drive. Shifting has improved to the point where some of my shifts are perfectly smooth, which I've never had, and I had just changed the ATF with Esso ATF like a year or two ago, probably 15 k mile or so ago.

I'm wondering how soon I should change the fluid and filter again? A year? Less? Opinions?

I'd just like to keep a date in mind considering all the stuff that may have been dissolving out into my new ATF. The post by RunningTooHot does allude to a cleaning, almost flushing, effect.

It did just occur to me, though, that I did add about 2/3 quart in two separate level check/topoffs. I think that this shot of synthetic probably began to clean the seals This allowed molecules of dino and synth to thoroughly intermingle for a while, after which I drained the tranny, changed the filter, and filled it with synthetic. (OK, my shop did it.)

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Bob Roe
Lehigh Valley PA USA
1973 Olds 88, 1972 MB 280SE, 1978 Datsun 280Z, 1971 Ford T-Bird, 1972 Olds 88, 1983 Nissan Sentra, 1985 Sentra, 1973 230.6, 1990 Acura Integra, 1991 Volvo 940GLE wagon, 1983 300SD, 1984 300SD, 1995 Subaru Legacy L wagon, 2002 Mountaineer, 1991 300TE wagon, 2008 Murano, 2007 R320CDI 4Matic 52K, some Hyundai, 2008 BMW 535xi wagon, all gone... currently
2007 Honda Odyssey Touring, 2014 E350 4matic