TCS...Think about this for a sec when it comes to oil break down....How long was it in the ground before it makes it to a bottle on a shelf??
What kills the oil sorta speak is when you spark her up,idle it 10 minutes,drive to a store 3 minutes,shut it off for 5 min and then back home..That type of driveing and sometimes alot of idleing ...AGAIn its not that the oil breks down but in actually its the oils additive package that gets over come with contaminates..
If you bought your truck,changed the oil in your yard and never ever started it again,that oil would not change..
you tube has vids on flow ability when cold and warm and protection...Take a lil time and teach yourself a lil piece of mind..
I was a royal purple fan till i saw that when its cold,its a slow mover to places where it needs to be,protection was awsome but just slow gettin to where it needs to be if you live in a cold part of the world like me in novascotia...On a cold winter start up i want oil where it needs to be in a second not 3,6,10 seconds later..