OK I have had Amsoil in my truck now for around 3000 miles. Since I put it in my oil pressure has been lower. About 8-10 psi lower. Don't understand? I have checked the oil level several times and looked for leaks everything seems fine. At idle the pressure is exactly the same as before with the old oil. Just when I am running down the road is it different. Did anyone else experience this with Amsoil or is this just something that happens as the truck breaks in?