Bedlam that was a nice set up you had there.
I always have been tell me how terrible my truck is and that its going to blow up on me and often its total strangers while at the gas station. Most of the time I just look at them and smile.
I keep up on oil changes and everything which has helped. When I drive her I work her hard not to the point of abuse but I do push her.
I don't have any additional filtration for oil or coolant. At times I kick the idea of getting a 6.7L but then I think about the payment and I snap out of it.