Bought this car used for my daughter with 52,000 miles. This will be it's first oil chnage for me, dealer changed it with who knows what when we bought it. Currently running RX and wondering what to put in when I drain it. Specs seem to lean towards heavier oils, but they recommend everything from 5w30 to 10w60. Should I go with M1 0w40 or 15w50? BTW, she doesn't put on that many miles, so this fill may see some winter use.