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1

The lower level on the dipstick is fine for most of the "normal" operating scenarios. If you were doing extreme angles ie off-roading etc then it could possibly lead to oil starvation. For a Polo, then you won't have caused any damage. Just keep up with the servicing and get a friend or the mechanic to show you what to look for. Checking oil is ...


2

It's possible that the testing OBD system could cause damage to the car's systems, but it's very unlikely. The reader could have sent a surge of power to the ECU, which is the engine's brain, but that would probably have shorted it out and it wouldn't even start up. That's not to say that the mechanic couldn't have damaged something and caused your problem, ...


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