Hi
I have a 2000 Mazda Protege LX with the (1.6L DOHC) ZM-DE engine, and since it was new, I detected a noise at aprox. 2,400 rpms in 2nd gear, at that time my father was the owner and he at the next fill up he refilled with 93 Octane Gasoline and the noise disappeared, now i have that car and...