I have used E6 Urania/Petronas oil in Ford Escort 1.3 OHV (1993) for 2-3 OCIs and E4/7 prior to that. In total over 100k.
Ford went to scrapyard with 190k for rust problems, engine was sound, some piston knock on startup, overall better than others. Oil I have used was PAO, crankshaft seal leaked- probably from age. Valvetrain was a bit varnished, so I'm not completely sold on a cleaning ability of a HDEO, compared to ACEA PCMO. Maybe compared to the API spec.