Brett, I think what your brother is referring to is Paraffin wax and not plastic. From what I understand they have removed the wax but have never been able to confirm that. I know in years past you could tell a motor that had run Pennzoil during a teardown by the wax in the oil passages. Rotella is good oil. So is Delo just have to watch out for that warranty thing. So while you’re motor is under warranty use Pennzoil or Rotella and after warranty use whatever you want. I know I still use the Mercury synthetic oil because that is the only oil that they recommend until my warranty is up than I will probably switch to Mobil 1.
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