I have 3 qts of the old QS Defy 10W-30 with high ZDDP left over. Need five qts for an oil change. Since SL Defy is no longer available, which oil would you choose to mix with the 3 qts of Defy? Does anyone know if the SN additive package in "new" defy is the same with reduced ZDDP? If so, I guess this would be the obvious choice.