I just had my tire guy change my oil for me, since A) I had to go to my tire guy already, B)I was due , and C) too much going on to do anything right now.
When either I or my normal mechanic do my oil, we both use 20w-50. My tire guy put in 10w-30.
I have an m42 engine, with about 151k. I am concerned mainly because I am going on a long time next weekend. I am driving from Southern California to Tucson Arizon, about 470 miles each way.
What's the deal? Should I be okay?