Well, engine oil is the oil which we have to put in our bike'e engine. and for every bike there is different engine oil. different in the sense the grade of the oil and not the company of the oil. .
and for every bike, you get a booklet with your bike. and in that booklet, you have every information related to your bike. and in that book its also mention which grade of oil is good for your bike.
For example. I have a pulsar 150 cc dtsi. so for my bike . the good grade is 20w50.
well from my observation. the grade is in W, where ## is number like 10, 15, 20 to 60.
So please put the oil which suits your bike the most.
So next time always ask your mechanic to put the specific grade of engine oil, which you will tell him.
And for getting the grade of your bike. refer to your booklet.
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Thank you