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API CF

Good day,

Please your help
I just noticed from the the API Motor oil guide that categories CI-4, CH-4, CG-4, CF-4 are recommended where the older versions are required including the former API CE and CD; however they don´t list the API CF.

The description of API CF is "For off-road, indirect-injected and other diesel engines including those using fuel with over 0,5% weight sulfur".

What is the reason that API CI4, CH4, CF4 don't include API CF . What could happen if API CI-4, CH-4, CF-4 are used in engines requiring API CF, considering that sulfur content is < 0,5%

Thanks in advance
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