Check out: http://robert.aitchison.org/tiki-page.php?pageName=Mazda3+DIY+Oil+Change
Bottom of the engine on the oil pan.
The 2005 Mazda MAZDA3 has an inline 4 engine.
The 2005 Mazda MAZDA6 has an inline 4 engine.
The 2005 Mazda MAZDA6 has a 2.3 L base engine size.
The 2005 Mazda MAZDA3 has a 2.0 L base engine size.
The oil filter on a 2005 Mazda 6, v6 is on the front side of the engine block about 8 inches up from the bottom of the engine block. You have to go in from under the car. Don't know about 4 cylinder.
You have 2 fuse box locations on a 2005 Mazda 6. The first location is on the kick panel of the driver side compartment just below the dash. The 2nd location is in the engine compartment near the battery and the air filter.
The tranny drain plug is located on the right side of the engine and if you are looking at the engine from the right side, it is located on the very bottom left hand corner of the engine.
The 2005 Mazda MX-5-Miata has an inline 4 engine.
The 2005 Mazda MAZDA6's engine produces 160 hp @ 6000 rpm.
The 2005 Mazda MAZDA3's engine produces 148 hp @ 6500 rpm.
The 2005 Mazda MAZDA6's engine produces 155 ft-lbs. @ 4000 rpm.