Greetings,
Just bought a 1999 26' RV w/ Ford 6.8L V10 Triton w/ 89K miles. The owner of the last 3 years has used Valvoline Dino 10w40 but manual says 5W30. It has 1000 miles since last change. I'm going to be taking it this summer on 5K Road trip and thinking about going to full synth and just...
