Significantly, Importance and Need of Day by Day Energy Conservation and Fuel Saving Techniques Are Increasing. Various Attempts Are Being Made Towards Saving of Fuels. In Such Scenario, Importance of Alternative Fuels Can Not Be Ignored. It Has Been Observed That So Many Types of Cooking Oils Are Used in Hotels and Catering Industries. These Oils Are Used Once or Twice and Used Oils Are Thrown to Waste in A Huge Quantity. An Attempt Has Been Made to Prepare Bio-fuel Out of Waste Cooking Oils. Bio-fueled CI Engine Performance Analysis Is Done and To Control Exhaust Emission Mainly Soot Particles Diesel Particulate Filter System Is Used Without Affecting Engine Performance. No Modification in CI Engine Is Required.