This paper deals with an experimental analysis of performance and emissions of a single cylinder, air cooled, direct injection, compression ignition engine using synthetic fuel extracted from Tilia B233 refrigerator lubricating oil and waste cooking oil biodiesel. Biodiesel and synthetic fuel are produced by transesterification process using methanol and potassium hydroxide. Physical properties as well as liquid density, liquid viscosity, total acidity number and flash point are measured. Physical properties and their blends are compared with conventional diesel fuel properties. A first insight to the results indicates that, unlike biodiesel, synthetic fuel which is distinguished by their its low acidity, which enables its storage. In addition, their viscosity is quite high and require the use of synthetic fuel blends with diesel fuel. A careful investigation according to current limitations and standards leads us to a direct engine test with a maximum blending rate of 50%. Thus, blends are achieved by mixing 15%, 30% and 45% of biodiesels with a complementary amount of commercial diesel fuel. The experimental results are obtained on single cylinder diesel engine operating at 1600 rpm for a wide range of loads. Brake specific fuel consumption, specific NOx and CO emissions are compared for each blend with those obtained by conventional diesel fuel.