I’m curious about the Pennzoil Oil Selector, if I input my 2008 Toyota Avalon, spec’d for 5W30 Pennzoil Ultra 5W20 is recommended. If I input my 2008 GMC Acadia spec’d for 5W30 Pennzoil Platinum 5W30 is recommended. I would have guessed Ultra would have been recommended for everything, or at least the same oil would have been recommended. Can anyone provide insight into how this oil selector works?