The reason IH came out with a low ash for gasoline is that they were trying to get a long life oil to use in all their engines. They found that they needed two different types of oil to make things work. When they added more ash content the spark ignition engines developed many more valve problems. Failures in 300 to 700 hours on test engines.
Sulfur in the diesel fuel when mixed with water becomes sulfuric acid. The ash in the oil neutralizes that acid. To get to a hundred hour oil change interval they increased the ash content. This is why you should not use a low ash oil in your diesels, though with the low sulfur fuels the need for the higher ash content is greatly lessened.
The increased ash content caused problems with the newer gasoline engines by leaving carbon deposits on the exhaust valve stems. This doesn't cause much of a problem for an engine that is run under a uniform load. The problem comes when an engine is run with a partial load and then fully loaded or overloaded. The increased load raises the temperature of the valves and the increases temperature causes the valve stems to expand. The valve stems with the carbon deposits on them no longer have enough clearance and they will hang open instead of fully closing. The hot combustion gases passing by the partially open valve will burn it out just like using a cutting torch on it. When it happens it is very rapid, only a few revolutions of the engine. It was very common to see this type of failure in the spring and fall as these tractors went from light duty to heavy tillage. Using low ash oils will greatly reduce this type of failure on these engines.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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