Why do you want to continue to abuse your engine with obsolete oil?
Straight weight none detergent oils begat sludge. Further the heavy oil means poor lubrication when starting and running cold. The lack of anticorrosion additives guarantees pitting of the crankshaft as well as the cam shaft and the bearing inserts from moisture and sulfur in the oil. In the 40s engines lasted 30,000 miles between rebuilds on straight weight oils. Now the computer dies at 200,000 miles or the body rusts off and the beearing technology isn't that much different, but the oils are DIFFERENT!
If an engine is sealed only by sludge on shafts, then the oil passages are already plugged by that sludge and lots of parts aren't getting oil. Changing to a detergent oil isn't going to make that sludge in the passages worse, in time it might improve it. So when changing to that detergent oil it might be a good idea to change oil and filter more often to remove the sludge. Detergent oil should hold the sludge (and unless an engine has been run without an aircleaner in sand the sludge should not be abrasive) in suspension or solution until its drained.
So why do you want to abuse your engine plugging the oil passages and corroding the bearing surfaces when you could clean and protect it with modern oil?
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Today's Featured Article - Tractor Profile: Oliver 70 Row Crop - by Staff. The Oliver 70 was part of the "Fleetline Series" and was manufacturered from 1937 to 1948. The row-crop configuration could have either dual or single front wheels. The Oliver 70 was also offered in the standard, orchard and industrial configurations. The tractors were sold in Canada. An early advertisement states "Power when you want it - power when you need it - power to help put in crops when field conditions are right and time and help are limited. That's the power you'll find in an Oliv
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