my slip-up, oils I listed are all grp 5 ester based lubes, Not group 6. penz ultra euro pure will be classed a grp 6? natural gas to syn oil . motuls' esters were v , now double ester technology, some lines pao. should run that statement past dave at motul.
both neo(formally eon) is diester based and amzoil,in their early history, was diester based,amsoil these days a pao & or grp 3 based. redline is polyol.
Castrol's winning their court case with mobil changed what can be advertised as synthenic.
this subject has been hashed about on BOB's for years. advertising is what it is in 2014.