A car with a manual trans has no real expiration date. A car with an auto trans WILL blow up at some point and require a $3,$4,$5K rebuild.
—” WILL blow up at some point and require a $3,$4,$5K rebuild.”
I believe that to be a fact of automotive life.
But others believe in ATF conditioners.
...Lucas Oil’s Automatic Transmission Fluid Conditioner is designed to PREVENT slipping, leaks and wear to provide smooth, quiet operation while conditioning seals to extend the life of the transmission.
YMMV