Originally Posted by Bc65851
https://penngrade1.com/



https://penngrade1.com/performance-proven-the-case-for-the-original-green-oil/
"The results from all four tests prove the PennGrade 1 SAE 20W-50 High-Performance Oil is the same product today as the original Brad Penn product was more than 50 years ago — continuing to deliver the same proven performance customers have come to know and trust."


That statement really makes no sense. The API standards have changed many times over those 50 years. Today's oils bear little resemblance to oils from decades ago.

Master, again and still