Oh, another thing on synthetic oils. The first synthetic oil was ✌released on the general public in 1955 - years before Colt (the original GT) was released! It was very expensive, and not widely available. Like everything else, telephones for instance, the internet, even cable TV was developed after the first Colt GTs were released and has improved or been invented since.. The fact that synthetic oils were not included in the Case/Colt/Ingersoll manuals is frankly mute!
Guys this will be my last post ever on this site about oils..to me it is like talking about politics everyone has their own opinion, everyone their own experience, yet nobody wants to do the work and actually learn by research. I left this site a couple of years ago because of these types of arguments where so called experts knew better.. many described themselves as mechanics, etc.