@Jasemas Caltex products do have APIs so I dunno which oils you are referring to http://www.caltex.com.au/FPL%20PDS/H...ium%20Plus.pdf but I can agree that there aren't many products better than Penrite or Nulon for the average user

@Haanda, do you have a source for these ownership examples you just stated? I find it hard to believe that Castrol (a BP brand) can be owned partically by Shell because BP is such a huge company themselves and they own many smaller ones. Buying some new packaged Shell oil recently, I saw that it all comes out of HK now