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5.7 quarts with oil filter
3.8 to 4 quarts of engine oil.
The 2006 Mazda MAZDA6's engine produces 160 hp @ 6000 rpm.
The 2006 Mazda MAZDA3's engine produces 150 hp @ 6500 rpm.
The 2006 Mazda MAZDA5's engine produces 157 hp @ 6500 rpm.
For the 2.3L engine, 4.5 quarts with filter change.
6.3 quarts if it is the 2.5L engine
The 2006 Mazda MX-5-Miata's engine produces 170 hp @ 6700 rpm.
The 2UZ-FE V8 engine in the 2006 Toyota Tundra requires 6.6 quarts of engine oil.
7.6 quarts according to the manual for a 2.3L 2005 Mazda 3. I can't imagine it's any different for a 2008 Mazda 3 with the same engine.
5 1/2 quarts
The engine holds approximately six quarts.