My car has a problem. My spouse heard sounds coming from the car yesterday, and asked me to have a look today. I drive the car around, driving from SOGE to KL and back, playing with the accelerator, opening the windows and turning off the eight track to see if my car is giving further audible sounds. No dice.
So, I take it to my trusty mechanic of many years experience. After listening to the symptoms and lack of, he says:
Fill it up with two tanks of premium fuel, and come back if the problem crops up again.
He had a tech reason to give the instructions above, but man…
Wata - Malaysian Oil and Gas Engineer 
yeah right!