Just add some 5w20 to the delo if you find that the delo pegs your oil preasure or like in my case made it idle rougher. Look for a CsT calculator and blend the delo to 10w30. When I started using delvac in my gassers I could not believe how long the oil stayed clean looking. A local guy had over 400k on his tundra...just you caring for it and not being abusive means you are on your way to 300k.