QUOTE(zeng @ Nov 13 2017, 12:31 PM)
Obviously none of your family member ever rent shop space and/or employ a worker ever .......... in your life till todate.

I have worked as a mechanic before. Overseas. So I know how it goes in the shop. And if I wanted to, I know how to overcharge as well. But I don't.
But I understand that the system of charging for labour is all over the board here.
Labour = time cost.
How much do you charge your base rate for labour / time it takes to do the job = how much you charge the customer.
There is no logic of charging 30 ringgit for labour for an oil change, when the job takes 10-15 mins. Your shop labour rate is 180/hr? (care to note, this is shop labour rate so profit has been included, not the worker salary, which could be a bangla)
I have no problems of $30 if the service goes beyond just the oil change, like general checkup top and bottom (since the car is jacked up), clean your air filters, check and fill up other fluids, check lights, etc.
Again, shops here have zero PR. Want to charge also do not know how to charge properly. Again, I understand the concept time = money. If the mechanic spends proper time on it, he/she should be paid properly. The problem here, the mechanic doesn't know how to explain it to the customer.
I just change my own oil. I used to buy lots from Tesco when they have discounted oil. Buy the filter from spare part shop.
Oil disposal, I just take to my friends shop and empty it into thier tanki