my 2003 chevy malibu suddenly started making a terrible knocking sound, like the sound a can of spray paint makes when you shake it- only much louder.
A couple of weeks the oil light went on very briefly when i used the brakes. The oil change place was closed so I added a couple of quarts after checking the level (i waited after the engine was shut off for an hour, there was a little oil on the dipstick but definitely needed more). After adding the oil and letting it settle it was at the appropriate notch per the owners guide. A couple of days ago, I bought gas at a station I dont normally use. The car was driven approximately 40 miles after fill up and before the noise started.
I took the car to get the oil change and was advised to get it checked if the sound didnt go away in a day. The auto place says their diagnostic tool won’t work if my check engine light isn’t on. Its not, and has never lit up. I have no idea what to do next…I assume I shouldn’t drive it anywhere.
I remember reading bad gas can cause this sound, or a bad Co sensor (?) I am praying the oil light doesn’t come on when it’s already too late! Any advice?