Salam everyone, i have bought Alto Vxr two year back with around 175k on odo meter. i bought this car to learn driving, and i had zero knowledge about cars, engines, suspention and different part of car at that time. since i had zero knowledge, my mechanic suggest me to use Shell helix HX3 20w-50 and i am using this oil from very first day.
so far, I have driven 20k-30K km and my odo meter have reading around 196000. my car performance is good and gives good avg on CNG. In city my car gives around 180Km avg on full cylinder and on the highway it gives around 230km. The problem is my CAR GIVES REALLY BAD avg on petrol. it gives around 11 or 12KM per litre within city. I want to improve my avg on petrol and i have read in tihs forum that Shell helix 20w50 is not the right oil for carby engines and specailly for alto, tell me how to choose a right engine oil for my car.