How does the quality of Royal Purple Extended Life Oil Filters compare with other manufacturers’?August 17, 2018
What is the efficiency rating and at what micron size?August 17, 2018
Vehicles under warranty should follow the vehicle manufacturer’s recommended change intervals. For non-warranty applications, the useful life of Royal Purple premium oil filters is the life of the engine oil. Vehicles driven in severe conditions should follow the change intervals recommended in their owner’s manual; severe conditions are defined as racing or commercial applications, frequent towing or hauling, extremely dusty or dirty conditions, or excessive idling.