I tried several preshave oils when moving from cartridge to DE/straights. Personally, I have not found any extra shave benefit with the oils. If you have good prep and lather, I don't think the preshave oil adds anything. You might try a few shaves without any preshave oil to see how it goes. If you think one is helpful to you, then of the ones I tried TGR and Grooming Lounge had the best.