In the United States heavy duty trucking lubricants market, the drive for energy efficiency is influencing a transition from SAE 15w-40 diesel engine ... grades in SAE 5w-X and even 0w-X are ...

The best engine oil for Maruti Ciaz is the shell HX5 15W-40 which is the fully synthetic if it is a petrol engines and for diesel engines Shell Helix HX-7 Synthetic 5W-40.