Hi guys, hope you can help me -

My friend just bought a new 2013 Challenger with the 3.6L Pentastar V6 (build date January 2013). He wants to switch to synthetic oil in the near future & had some questions:

* The owner's manual states the Pentastar V6 takes 5W20 oil, but the oil cap says "0W20". Which grade oil should be use?

* When should he switch to synthetic oil? The car currently has 300 km on the odometer.

* What do you guys recommend for synthetic oil for the Pentastar V6. My friend was leaning towards Pennzoil synthetic.