mtnviper1963

This truck has 85K original miles on it and it drinks oil like crazy! The odd thing is, it doesn't leak, it doesn't smoke, and no oil in the radiator, so where is it going? I changed the PCV valve. I change the oil every 3500 miles and currently using Castrol high mileage 10-30, since that's what the previous owner was using. I tried a can of rislone thinking I might have a stuck ring but, did not help.