I have been using Pennzoil Platinum Ultra 5W20 for years in both my 2008 Mazda Miata and my 2006 Ford Mustang GT convertible and have been very happy with it. My only problem is I am having more and more problems finding it. I can't decide whether to switch to M1 or Amsoil or Pennzoil Platinum...
I have heard some discussion of Shell X-100 motor oil. It is supposed to be very good for older classic car engines, pre-catalytic converter cars. Really? I remember hearing of X-100 when I was a kid. I didn't even know it was still available. Is there anything to this? I have a restored...
I would have to guess it was somebody at the factory thinking it would be funny. I doubt it hurt anything. Either that or you are using really [censored] oil filters. LOL