The unfortunate truth is we are the small minority of people driving 50 or 60 year old cars (also have a 65 GTO). The lubricants today are all made with modern cars and EPA laws in mind, not our cars needs. It is very difficult to keep up with the changing formulas used in these oils. My hope is the aftermarket continues to provide alternatives safe for us to use. This has happened for engine oils. Hopefully the heavy weight gear oil will be next. It seems our cars, are going the way of the Dinosaurs (pun intended), and us along with them.
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