I don't change my own oil, I have it done at a place I trust. I need your advice on which is my best lubrication option, my vehicles are a Toyota 4.7L and a Honda 3.5L. I can use M1 syn oil with an M1 filter for about double the cost of Chevron oil with an inexpensive filter. What is better for my engines M1 at 6K intervals or dino at 3K intervals?