I run regular rotella 15-40, but the motor is rebuilt and has aftermarket cam, so I do it for the extra zinc. For yours, what willey-mo said.
You can run the high mileage oil - it's usually no more expensive.
And Walmart brand oil is actually not bad..... just sayin 
__________________
"Roads? Where we're going we don't need roads." -- Dr Emmett Brown 
"When this baby reaches 88 miles per hour, you're gonna to see some serious sh  t!"
73 Wagoneer - 4.6L Stroker (yeah baby!!) t176/d300, 3.73's, 33" muds, 4"spring lift, 2" body. Offy dualport w/ Quadrajet, pertronix, flowmaster.
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