regular (83)...most mid size cars that arent of fancy origin (i.e BMW, Lexus Auti and so fourth) only require regular bc the higher fuel grades produce more heat which although last longer some cars cant handle the extra heat in the engine...unless specified other wise by your car dealer than use regular
Not sure if you are asking about fuel oil or motor oil. As for fuel oil (gasoline) regular is fine, as for motor oil 5w-30 is recommended for most later model vehicles with a few exceptions that recommend 5w-20. Your owners manual or a Haynes repair manual will tell you exactly what type is recommended for your specific vehicle as well as tell you the fluid capacity.
5w20
The 2003 Mazda MAZDA6 has double overhead cam (DOHC).
The 2003 Mazda MX-5-Miata has double overhead cam (DOHC).
5W-20 is recommended
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.
regular unleaded
5w20
10w30
1157A
5w20 or 5w30
dextron mercron
The type of brake fluid a Mazda 323 made in 1997 uses is called Dot 3. This is the standard type of brake fluid for most modern cars.