MONO ENGINE OIL CF 10W Product Code 0034 MONO ENGINE OIL CF 10W is a heavy duty diesel engine oil developed to meet the requirements of a variety of diesel engines operating under severe conditions. MONO ENGINE OIL CF 10W is suitable for use in a wide range of on and off-highway applications where an API CF oil is recommended. MONO ENGINE OIL CF 10W is based on high quality refined virgin base oil in combination with a special additive package to ensure the following properties: