One problem related to manual transmission has been reported for the 2006 Mazda MAZDA6. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2006 Mazda MAZDA6 based on all problems reported for the 2006 MAZDA6.
Engine power decreases substantially going uphill when you push accelerator. Even after the recall item was fixed (reprogrammed computer), it still does it, especially on other then 93 octane gas which is not always available. When merging into traffic, had a few close calls with accidents.