Process that uses an additional riser in FCC units (see FCC) to increase production of diesel and propylene. Changing market conditions are putting less demand for gasoline and greater demand for diesel and propylene so that under the MILOS system refiners can run their FCC units under different modes. In the propylene mode, propylene production can double compared with a base-case FCC unit while maintaining traditional diesel yields and quality. In diesel mode, diesel production can increase up to 20% with a seven point rise in cetane number and increased propylene production. The FCC unit can run anywhere between these modes or revert to normal FCC operation by changing operating parameters.