Mazda 6 Service Manual: No.20 fuel odor (in engine compartment)

No.19 exhaust smoke

No.21 engine noise

Other materials:

Mazda 6 Service Manual: Rear oil seal
REAR OIL SEAL REPLACEMENT 1. Remove the flywheel. (MTX) (See CLUTCH UNIT REMOVAL/INSTALLATION) 2. Remove the drive plate. (ATX) (See DRIVE PLATE REMOVAL/INSTALLATION) 3. Remove in the order indicated in the table. 4. Install in the reverse order of removal. Rear Oil Seal Installation Note ...

Mazda 6 Service Manual: Intermittent concern troubleshooting
  Vibration Method 1. If malfunction occurs or becomes worse while driving on a rough road or when engine is vibrating, perform the steps below. Note There are several reasons vehicle or engine vibration could cause an electrical malfunction. Some of the things to check for are: ...