I called mobil and they said with the EPA rules and the goverment wants to rid us of 2 stroke motors, for 4 stroke, because of the polution levels of a 2 stroke. Its not worth producing it, and the sales of the oil has declined over the years due to the declining 2 stroke market. Look at the motorcycle market especially the dirt bikes, you cant hardly find any 2 strokes anymore, 5 years ago no one wanted to race a 4 stoke bike, now they are the norm. Sign of the times..............