Hi- Just got through looking at the Mobil 1 and Red Line sites. Both do not list 5W-20 viscocity any longer. I know that Red Line had a 5W-20 in production for a while. Is it still available? Mobil 1 was rumored to start production of 5W-20, but I don't even see that 5W-20 is an option for their Supersyn line. Where's all the 5W-20 going?