345,000 miles on my 1995 Acura Legend, original C32 engine and transmission. 30,000 miles. Consequently, I have friends who work in shops across town and I have not found anyone to change the fluid after changing the automatic transmission filter/strainer. And I totally understand. The AT stays in 3rd gear when it's having a little understated fun - seriously, with other cars on the track. Track. So I'm a bit clueless. And then I stumbled across this product without even knowing it existed. I added quite a bit to the AT and the stick/slip stopped. I can say it still needs a service or a new transmission but it really helped and gave me some time before catching a lower mileage AT or maybe an MT conversion. I ask, without a shadow of a doubt, this product did what the bottle promised.