All this reminds me of a conversation I had years ago with the owner of a '53 170S diesel which was written up in an MB newsletter because he was about the turn over 800,000 miles with the original 4 cyl. engine. He commuted 260 miles/day to work. I asked him what kind of oil he used & how often he changed it. His reply: RECYCLED oil but he changed it every 2,000 miles!

Someone else who was written up in The Star awhile back is about to put the same mileage on his '59 220S (orig. owner). Used nothing but 10W-30 fossil but again dropped it every 2,000 miles.

Both these cars started out when motor oil was no where advanced as it is today. Yes it does say something about regular oil & changing it hot & often.