[en] Lattice QCD with a light isodoublet and a heavier strange quark is simulated on a 6x12³ lattice. Metastability studies on the 6x12³ lattice give considerably weaker evidence for a first order transition than on a 4x8³ lattice. Comparison of chiral condensates and energy densities with similar measurements on 4x8³ and 4x12³ lattices also indicate that the quark-gluon plasma transition becomes less abrupt as the lattice size increases and could be just a crossover phenomenon at the quark masses simulated here. The light quark and strange quark energy densities are suppressed in the transition region and approach their high temperature limits from below. (orig.)