Mazda 6 Service Manual: No.16 high oil consumption/leakage

No.15 emission compliance

No.17 cooling system concerns-overheating

Other materials:

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: ...

Mazda 6 Service Manual: Air filter inspection
1. Remove the air filter. 2. Inspect the air filter. If the air filter is damaged, excessively dirty, or foul smelling, replace the air filter. Note The air filter cannot be reused by cleaning it with water or compressed air. Replace the air filter at the following interval, depe ...