thats a school boy error on a pre pick system,,,,, doing 30 pre picks you tend to run on auto pilot
"oil,air, plugs, sump plug" "oil,air, plugs, sump plug" "oil,air, plugs, sump plug" "oil,air, plugs, sump plug" "oil,air, plugs, sump plug" "oil,air, plugs, sump plug" "oil,air, plugs, sump plug" "oil,air, plugs, sump plug" "oil,air, plugs, sump plug" "oil,air, plugs, sump plug" "oil,air, plugs, sump plug" "oil,air, plugs, sump plug" "oil,air, plugs, sump plug" "oil,air, plugs, sump plug" "oil,air, plugs, sump plug" "oil,air, plugs, sump plug" "oil,air, plugs, sump plug" "oil,air, plugs, sump plug" "oil,air, plugs, sump plug" "oil,air, plugs, sump plug"

hence i give 4 for ST's every now and again as its just habit,,,,, and all mechanics blame the parts for booking wrong parts EVEN WHEN THEY ASK FOR THE WRONG ONES !!!!