My 1999 Suzuki Esteem 1.6 had it's transmission fluid replaced with Valvoline 75,000+ miles transmission fluid, it is supposed to be formulated for high mileage transmissions, I started using it around 77k miles the car now has 133k+ miles and has never had any transmission problems.
As far as the tranny dropping in and out of overdrive that could be a bad switch in the shifter handle between the front seats or a wiring problem, have the car scanned for codes.
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