|
I have used rotella, valvoline, delvac, and delo conventional oils. All seem to do very well. The valvoline seemed to get darker than the others changing at 5k mile intervals. I don't know if this is a good thing or bad. Maybe that is telling that the oil is removing deposits better. Don't know. I wouldn't change to synthetics seeing what they cost. Althought I only have 42k on my truck, my brother has a 89 model ctd with 500k and a 96 ctd with 240k and never ran anything but delo in both of them with no problems. I don't know how many more miles you could gain using synthetics. Alot of people swear by synthetics though.
|