I run straight 30W castrol in my Case 800 but it is the heavy duty stuff for that type of engine.
I wouldn't use regular "automotive" oil ONLY for the reason of being lower zinc levels. 1 change probably won't hurt anything but the next change i would do some research and find some "normal" or high zinc content oils. AMSOIL makes a high zinc (Z-rod) oil mostly for the antique car crowd but would certainly work on our old tractors too.
remember not all oils (synthetic or conventional) are created equal. even from the same company. if they are API certified they meat a MINIMUM spec and that's all. if you want a better oil you need to look at the TBN value. the higher the number the better the oil.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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