F20 can use straight unleaded gas- old manuals suggest 1 cup of engine oil to 5 gallons of gasoline. The engine doesn't run fast enough- cam duration isn't open enough to cause exhaust valve seat erosion problems. IHC Super H,Ms may have some erosion if run steadily at 1800 RPM, Cases and AC late 50s noted to also be susceptable- this from a Wallaces Farmer articles early 80s when unleaded became standard- 1500 RPM seemed to be the start of extra erosion. Ford Ns were not at risk as Ford had used stellite seats to start and JD twins didn't run too fast and valve timing didn't have long duration. F20 governed 1000/1200 RPM- just add a bit of oil to gas like old manuals suggested. Oil for winter? Try 10-30 to ease cranking- F20 is more of a splash system with rod bearing trays and crank ball bearings instead of plain bearing pressure lube. the 10-30 will flow and splash a bit easier than straight 30. RN
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Today's Featured Article - Pitfalls of Tractor Engine Rebuilds - by Chris Pratt. The first pop after you have put the machine together with your own hands is exciting and pleasing. The whole experience can be marred if one moves too fast and makes too many assumptions that they can just use "as is" some parts they should be closely scrutinizing and possibly attended to. In such cases, rework makes what could have been a fun project turn into an irritant or even a nightmare. Minor Irritants To give you an example of an minor but irritating proble
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