I was given an awesome Boos end grain maple cutting board for Christmas. I've only had edge grain boards previously. I cleaned it and then oiled it. In the past when I've oiled boards they will absorb maybe one or two coats of oil and then will leave residual oil that I wipe off. This end grain board just absorbs the mineral oil like crazy though. It absorbed 3-4 coats and left no residual oil on the surface. Is that normal? Should I keep on oiling it until it stops absorbing it, or should I stop since it already took a few coats?