I have a 2009 Dodge Ram Hemi 5.7 litre. It calls for 5w 20. I like to change my oils around the 5000 mile mark but keep in mind I do a fair amount of stationery idiling also more so in the winter. I just got the M1 bug but after coming here I am completely confused. According to my oil change of 5000 miles intervals along with my idiling, is regular Mobil one full synthetic ok? I was leaning towards Valvoline Syn power or penzoil platinum? I narrowed it down to one of the three oils mentioned above.