FWIW, to me, synthetic oil and nitrogen for tires are of quite dubious benefit, and considering the cost, given a choice, I wouldn't pay the difference. Near 50 years ago I was a mechanic, I've NEVER seen an oil failure, seen plenty of lack of maintenance failures. Just keep the oil and fluids changed. 2ยข
You are aware engines have changed drastically in 50 yrs...right? Clearances, OHC, DOHC, VVT, DOD,AFM,mechanical high pressure fuel pumps, variable displacement oil pumps...the list goes on...those are all part of modern lube systems. You can mess with manufacture suggestions all you want.....I would not!
