[Mr. V]

Beginning in my twenties I slowly taught myself to service and repair my own vehicles: I encourage others to do so as well.

As part of preventative maintenance I do in fact drain and refill (do not flush) both the manual and automatic transmissions in my various vehicles.

While you're at it change your oil and filter more frequently than recommended: it's worth the extra money as it should allow your engine to last much longer before needing a rebuild.