This is an old Dodge truck, maybe '86 or so with either 66K or 166K miles on it. The oil light goes on and the oil pressure drops off of the gauge during hot idle. Oil pressure is fine when running. 2. The truck has a very rough idle and initial acceleration, it feels like it's having a seisure. Smooths out a bit when it gets going. I'm thinking a bottle of fuel system or carb cleaner and a bottle of 20w-50 (and/or STP Oil Treatment) may help this truck out. The oil is at the bottom of the dipstick (a wee bit below the low mark) when the truck is hot, which means I can add at least one quart to it. Don't know what type of motor (size) it is, but may be a v-8. What do you think?