I have 02 2500 d-max w/40k. This summer noticed oil pressure drop below 40 at idle for first time since new. Pressure jumps right up off idle but I am not sure if this is normal for our trucks? Also I get average of 10 to 12 mpg but truck is almost always hauling 4000lb trailer with sheds on it.
Allison crapped out already now leaks after rebuild, so sick of dealers I don't even want to bring it in.