I change the oil in the 80 about every 10k. I run the rotella t6 syn 5/40. Used oil goes to the transfer station in fort collins (since estes park is in larimer county). Super nice there, I just drain the oil from the cruiser into a 5 gallon bucket, when its full, take the bucket, empty and repeat.
'97 lx450, 170k, factory lockers, ome 850/863, 285's, 4 working doors(1 more than the old fj55 )
'74 project pig (sold