Rumbling noises in a 10-year-old car could be tires or suspension issues. If your speedometer is reading high after an oil change, the unit may have been switched from miles per hour to kilometers.

Hello Paul, when I drive above 80km/h, I hear a low rumbling sound that I cannot trace. At lower speeds, everything is quiet, so I never bothered checking. Could this be tyres, wheel bearings, or ...