Yeah, under the crank installation section of the 2000 factory service manual, step (8) is: Clean and oil all cap bolts, install caps and alternately tighten to 85 ft lbs.
OK, that sounds like it has a basis in actual engineering; I'd use the 2000 manual and accept that they spec'd the main bolts for oiled. My early LA manuals don't say.....
But I'd still advise the dry torque on the rod bolts; torque them oiled and you'll exceed the rated bolt tensions for grade 8 3/8"-24 UNF bolts. Tho' now I realize I am thinking of LA rod bolts, and have been assuming that Magnums have the same....