Hello guys,i have been using Shell 10w-30 oil in my vehicle for a long time, this oil is semi-synthetic so I want to replace it with a fully synthetic one. I want to use 0w-20 oil for fuel economy but the manufacturer recommends min. 5w-20 oil. Can I use 0w-20 oil on my car ? My car is Hyundai Accent Blue,1.4 D-CVVT nat.asp. engine,60.000 km.The country i live in is max. 35 degrees in summer, min. 0 degrees in winter.