The motor fuels market demand is for more middle distillates and ultra low sulfur diesel in particular. VGO hydroconversion addresses both market objectives, notably through mild and high severity hydrocracking. The best performance is squeezed out of hydrocrackers by employing HRK 558, designed using ACE™ Advanced Catalyst Engineering technology. This drop-in catalyst replacement solution is capable of producing an instant debottlenecking of both mild and high severity hydrocrackers.