When is it necessary to change the transmission filter in a 1999 CL.Acura?

It's generally recommended to change the transmission filter in a 1999 Acura CL every 30,000 to 60,000 miles, or as specified in the owner's manual. Additionally, if you notice signs of transmission issues such as slipping, rough shifting, or unusual noises, it may be a good idea to inspect and replace the filter sooner. Regular maintenance is crucial for ensuring the longevity and performance of the transmission.