2011 Silverado 6.2l engine. Only sees occasional towing and probably no more than 4k pounds. I may be averaging only about 6k miles a year now. Truck currently has 94k miles. Planning to change it at 95k and every 5k thereafter. I have been running Amsoil with no complaints, but wondering if I'm just as well to use a cheaper oil since I'm changing every 5k. What say you? And oil filter brand?