Truth be known any motor oil you purchase today is superior to what was available in 1948. Zinc additives are crowed about on cyber forums and they are needed for flat tappet cams WITH high spring pressueres that you do not have. Zinc won't hurt anything but neither will it add anything to an old worn in engine with weak valve springs. You should be concerned about non detergent vs detergent IF it has been run extensively with non detergent oil. Then you would be best served to either continue on with it or change detergent oil frequently until the gunk is cleaned out. If its going to sit all winter then 30Wt is fine. Personally I run 15W-40 diesel oil in my old tractors. What kind of oil just isn't critical, what is critical is to be sure tbere is oil in it and change it now and then,, in my opinion.
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Today's Featured Article - Tuning-Up Your Tractor: Plugs & Compression Testing - by Curtis Von Fange. The engine seems to run rough. In the exhaust you can hear an occasion 'poofing' sound like somethings not firing on all cylinders. Under loaded conditions the tractor seems to lack power and it belches black smoke out of the exhaust. For some reason it just doesn't want to start up without cranking and cranking the starter. All these conditions can be signals that your unit is in need of a tune up. Ok, so what is involved in a tune up? You say, swap plugs and file the points....now tha
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