[MJN]

I run AMSOIL Z-Rod 10w30 in my '74. I also used AMSOIL Break-in oil when I rebuilt the engine, no issues, no leaks and no consumption. Everything AMSOIL makes is full synthetic.
https://www.amsoil.com/p/z-rod-10w-3...motor-oil-zrt/

Another alternative to Z-Rod that also has higher levels of zinc would be AMSOIL Premium Protection 10w40.
https://www.amsoil.com/p/premium-pro...motor-oil-amo/

Also- here is a good write-up about the differences between racing oil and regular motor oil.
https://blog.amsoil.com/racing-oil-v...he-difference/

AMSOIL offers a Preferred Customer program that saves you 25% off MSRP and you get free shipping with orders over $100 along with other benefits too.
https://www.amsoil.com/offers/pc/
Another thing about pricing- Amsoil adjusted their prices three times in 2021 whereas their competitors did six or more times and usually by 10% or more.
This is a great website to learn more about whats happening within the lubricant industry;
https://jobbersworld.com/category/lubricant-news/