How often does a buick need to flush the transmission?

I do it every year.

25000 km depending on how often you drive it , or 160 000 km if you drive it like an old man.

Car transmissions should be flushed at least once every two years, that's what most car manufactures say and mechanics

If you wait for a transmission to have problems before you have it professionally flushed, you've waited to long. It really depends on your driving conditions but in most cases I would flush it every...

It depends on how loyal you are at changing your oil. Do you change your oil every 3,000 miles? If so you can wait to do it every 40,000-50,000 miles. If you are not so good at changing your oil and...