Petrol and diesel drivers have been urged to ignore advice around a common fuel-saving tip as it could destroy a vehicle’s engine and battery life.
YouTube mechanic Scotty Kilmer warned that turning cars off when they come to a standstill could quickly “wear out” vital parts.
Although Mr Kilmer admits the solution would save some fuel, he feels the savings were not worth the potential long-term effects.
He has encouraged road users to press one button when they enter their vehicles which will turn off an automatic stop-start system.
This is usually a letter A with a circle around it and can be found on the dashboard just behind the gear stick.
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Speaking on his YouTube channel, he said: “Now at the max you might get two to three percent better gas so it doesn’t really affect much at all.
Except for one big thing, not only does it make the cars more expensive to build It also makes them wear out faster.
“Now you might see this little button. See this little Button here that says ‘A off’ Well guess what? Have it off, see the lights on.
“Now it won’t turn the engine off when you come to a stop. It will continue to run like a normal car. It won’t keep turning itself off.
“Most of the wear on your engine occurs when you start the car right. The oil is in the bottom of the engine. The oil pump has to spin to pump the oil to the top of the engine to start lubricating.
“Every time you shut the car off the oil goes back down it has to be pumped back up again.
“Do you really want to be starting and stopping your car all the time? It will wear the engine out faster, it will wear the starter out faster and it will wear your battery out faster.”
The RAC has previously addressed these concerns with experts stressing that the system is designed specifically to deal with more start-ups.
The breakdown group claims new tools such as dry lubricants on engine bearings mean that today’s cars can “withstand frequent engine restarts”.
RAC chiefs also admit newer vehicles have “robust batteries with a high capacity” that can stand up to extra use.
They suggest car computers check charge levels before shutting down an engine and may not turn it off if there is insufficient life left.