Reading more is dangerous when you follow it blindly. In fact manual gives choice of engine oils according to temperature but problem is two fold
1) Range of temperature given in manual does not match with our climate we usually have higher temperature in summer exceeding 40 degree Celsius while manual is talking of max 30 degree Celsius.
2) I did not find any thing in the manual in relation to old and new engines requirements.
As far as choice of brand is concerned it is only because we live in corrupt society, every other person is corrupt until proved otherwise. Therefore I am not comfortable in pouring locally packed oil in my car.