Fact-checking common car beliefs
RACQ Principal Technical Researcher Russell Manning clears up some common misconceptions relating to cars.
Speedos always read a bit high, so it’s safe to drive at a slightly higher speed than indicatedFalse. Starting in 2006, speedos were required to either read accurately or higher than the vehicle’s true speed. Most have some degree of error, but some don’t, so unless you know your speedo’s error, you risk exceeding the speed limit if you do this.
Lighter coloured cars are cooler inside than darker onesTrue, sort of. Our testing of parked vehicles has shown that the interior temperatures of a white car can be about 4°C cooler than for an equivalent black car. However, with typical internal temperatures exceeding 70°C in Queensland’s summer, colour really doesn’t make much difference – it will still be really hot inside.
Coolants can be mixed provided they are the same colour