Not A10, but may be relevant: I ran a '74 Karmann Ghia, air cooled, no filter, for 200,000 miles and sold it still running fine with 10w40 high detergent oil changes every 1500 miles. When I met my wife she drove an old VW beetle. The first time I checked her valves I couldn't believe the crud in the rocker covers and all over the rocker arms and shafts. Mostly water sludge but some harder black crap as well. 2 quick oil changes (about 500 miles) and when I next checked the valves it looked like new parts inside. Continued to run fine for a couple years after until the fuel pump diaphragm gave out and filled the crankcase with gasoline.
I don't doubt that it would be possible to loosen crap and trash bearing shells, but I see no reason not to run a good grade of modern oil in an engine that starts out clean. IMO frequent changes are the real key to long life. I have 265,000 on my 4 cylinder Jeep on full synth and 6k changes. Still has almost 60psi oil pressure.