Mazda 6 Service Manual: No.20 noise occurs at idle when vehicle is stopped in all positions/ranges

No.19 excessive shift shock on torque converter clutch (tcc)

No.21 noise occurs at idle when vehicle is stopped in d, s, l ranges, or in r position

Other materials:

Mazda 6 Service Manual: Inspecting Engine Oil Level
1. Be sure the vehicle is on a level surface. 2. Warm up the engine to normal operating temperature. 3. Turn it off and wait at least 5 minutes for the oil to return to the oil pan. 4. Pull out the dipstick, wipe it clean, and reinsert it fully. 5. Pull it out again and examine the level. The ...

Mazda 6 Service Manual: Service cautions
HANDLING INSUFFICIENT REFRIGERANT LEVEL If an insufficient refrigerant level is detected at troubleshooting, do not charge (add) the refrigerant. Because an accurate amount of refrigerant cannot be determined from the pressure indicated on the manifold gauge, never charge the refrigeran ...