never never never use petrone 20/50 in your new car. Am afraid how did you choose to use this oil. This 20/50 oil is for the older, weak and very old cars. Never feed it to your absolutely new car.
Use 5/40 grade but use this oils from imported companies. They have very nice quality and longer intervals too.
Depending upon your pocket, give priority to the following companies
Liqui Moly synthoil 5/40
zic xq 5/40
ptt performa 5/40
kixx 5/40 pao (poly alpha olephin)
and keep the changing interval 8~10k and change the both filters after 4k for sure.