Units from the time, there was not a GL-4/GL-5 oils? The old standard 50150 as G50, for 75W-90?
But yes, I like also Ravenol. Except using pure Rowes Topgear S 75W-80, I have mixed in ours garage a few times for tuned GTIs 5 and 6 with MT, MTF-3 and VSG in 75:25. Thats in no case worse than...