I installed the dual bypass filter on my truck in April. I currently have about 7,000 miles on the oil and about 6,000 on the filters doing moderate hauling. Amsoil recommends changing the bypass filter at around 25K and the full flow at around 7K. I have Rotella in it now and will use Rotella until I have to change the Bypass. The truck has a little less than 19K miles on it right now. Any information or suggestions on a filter change schedule would be greatly appreciated.