I have a Honda City GM 2010. I am currently using Castrol GTX having rating SAE 20W-50 and the car is purely running on Petrol.
Recently i discovered that the oil being offered by Honda has a rating of SL 10W-30. This oil has less viscosity as compared to my current castrol GTX. The guys at Honda claim that Castrol GTX is too thick and is not appropriate for the vehicle. Further i asked them if i should shift back to the Honda oil and he said that shifting back to the recommended oil is also not recommended whereas there are many sites on the internet that say that you should use higher viscosity oils in summer and lower viscosity oils in winter.
So now iam at a point where i need to purchase oil for my car and iam totally confused. Let me add that the current oil iam using gives me superior averages and outstanding performance. I have been using it for the last 1.5 year on four different cars and i have no problem on any of them.
Please assist me guys. Expert opinion will be highly appreciated.