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

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Mazda 6 Service Manual: Fuel Gauge
The fuel gauge shows approximately how much fuel is remaining in the tank when the ignition is switched ON. We recommend keeping the tank over 1/4 full. If the fuel level is low, and turn an amber color. Refuel as soon as possible. Refer to Taking Action. NOTE After refueling, it m ...

Mazda 6 Service Manual: Clutch fluid replacement
Caution Be careful not to spill clutch fluid on a painted surface. If this should happen, wash it off immediately. Note Do not mix different brands of clutch fluid. Do not reuse the clutch fluid that was drained out. 1. Remove the under cover. 2. Draw the fluid from the reservoir ...