Back to '79.
1. Synthetics were not being used yet by manufacturers
As roller motors were just around the corner.
2. Oils had some detergents , but lacked in Lubricate
3. Additives were STP.. LUCAS.. and " other Honeys"
4. So for the 79 in question, it went a couple decades before it had a more slippery oil. This could make more wear.
5. Cleaning out sludge is different than lubricity.
Seafoam may get things smoother , oil and intake.
6. With today's oils, few additives build film and help tolerances, but you may check out MOTORKOTE.
Go to you tube, search for Project Farm . This guy tests everything. His test on Motorlote was brutal, and it does the job of film build with lubricate.
I use it at every oil change.
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" Long may we DRIVE !"
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