Went back to Amsoil in my deisel Duramax. The only reason is cause It got darn cold here last winter and synthetic helps it start a bit better. I am going to start with the oil analysis again with a filter change every 15k.

But the fruits of the spirit is love, joy, peace, patience, kindness, goodness,faithfulness, Gentleness and self control. Against such things there is no law. Galations 5: 22&23