Evidently they have split the gas/diesel category on that product.
As you have figured out, Cx is for compression ignition engines, Sx is for spark engines.
The second letter designates the performance property for each oil. Generally it is emission compliance related. They are in alphabetical order, safe to go up, but not down from the mfg. requirements.
As for using it in an old tractor engine, it will be fine. No emissions concerns.
Here is some info, on the "oil categories" page, click across on the "gasoline" "diesel c" "diesel f" banners to open each category.
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Today's Featured Article - A Brief History of Tractors in Australia - by Bob Kavanagh. After Captain Cook's exploration of the east coast in 1770 the British Government decided to establish a penal colony in Australia. The first fleet arrived in 1788 and consisted mainly of convicts who were poorly equipped and new little of farming techniques. The colony remained far from self-supporting and it was not until the early 1800's that things started to improve. Free settlers started to arrive, they followed the explorers across the mountains and where land was suitable set up farms. T
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