According to most owners manuals, every 2 years or as needed.
about every 2 years
Contaminated fluid. Should be flushed more often.
once a year
every 3000 miles u should change them
How often do you change the transmission fluid in a mercedes benz c240
How to change or add transmission fluid to a ml 350 benz
Change the fluid and filter every 36,000 miles.
change both the fluid and filter every 50,000 miles
Topping off fluids are often not advised on vehicles. Fluid chambers are so well sealed that the only fluids that are added are after a change of the fluids. If fluids need to be added at other times, it is the sign of a major problem and should be handled by an expert.
100,000Km
15000 miles
Not required