Is it necessary to replace the filter when using a circulation machine for oil change?

[BeauLee]

The concept of replacing the filter applies only when changing the engine oil. However, changing the engine oil does not require the use of a circulation machine. Only transmission oil involves the use of a circulation machine for replacement, but transmission oil does not have a filter at all. Additional information: Introduction to car transmission oil replacement is as follows: The replacement cycle for automatic transmission oil is every 2 years or 40,000 kilometers. Due to the highly precise internal structure of automatic transmissions and the high cost of repairs, coupled with the fact that the commonly used gravity oil change method cannot completely replace the oil, it is important not to delay the replacement of automatic transmission oil to avoid greater losses. The location for changing the transmission oil is marked by two bolts on the transmission housing: the upper bolt is the oil filling hole, and the lower bolt is the oil draining hole.