help some questions... please
I own a 2013 v6 mustang. Changed the oil yesteday. Went to my local car parts store and asked them to set me up with oil and filter. They gave me 5w 20 gtx castrol oil and a napa filter. Question is the castrol gtx oil synthetic oil? It does not specify synthetic on web site or on container. And is it safe to use on these cars if its not synthetic? This was my first oil change so I'm not sure? I've heard of people using a product called royal purple. Is this a better oil to use in the car? If this is not the right oil can I just drain it and use the right oil? Please advise.
2013 V6 Mustang Automatic with the following mods: Roush Hood scoop, 3M Clear braw paint protector, MRT rear window louvers, 3M scotchprint carbon fiber roof wing decklid and scoop, strut tower brace, FRPP axleback exhaust.