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The 2009 Mazda MAZDA6 has double overhead cam (DOHC).
The 2009 Mazda MAZDA5 has double overhead cam (DOHC).
The 2009 Mazda MAZDA3 has double overhead cam (DOHC).
The 2009 Mazda CX-9 has double overhead cam (DOHC).
The 2009 Mazda MX-5-Miata has double overhead cam (DOHC).
You need a carbon filter for diesel fumes
no fluid it is electric asist
You need to have a special filter wrench to do it, which is a cup-type as opposed to a band-type. Filter is cartridge not spin-on.
You need an air filter and a fuel filter. On the larger models there is also an oil filter.
It depends on the type of filter... different filters are designed differently. You would need to tell us the model or type of filter.
oil filter is on top of engine, your wll need a 32mm socket to unscrew plastic housing by intake manifold, filter is cartidge type, not metal screw on type.
It is built into the fuel pump. If you have the know-how and the tools, you can do it yourself. If you've never performed this type of task... take it to a shop.