NOVELTY - A fuel composition comprises: at least one petrochemical fuel; at least one biosynthetic oil; and at least one stabilizer mixture (0.001-0.5 vol.%). The stabilizer mixture comprises: at least one ketone; at least one alkane; at least one alcohol; at least one alkene; at least one aromatic naphthas; at least one nitrate; at least one antioxidant; and at least one polydentate metal deactivator.    USE - For diesel engines (claimed); for application by powdered diesel engines and for other fueling and heating applications; as an internal mechanical lubricant.    ADVANTAGE - The fuel composition meets quality standards selected from ASTM D975, ASTM D7467 and ASTM D6751; and is configured to prevent the loss of horsepower and torque of a diesel engine compared to Diesel Number 1 fuel or Diesel Number 2 fuel; is configured to prevent abnormal wear of engines compared to Diesel Number 1 fuel or Diesel Number 2 fuel; is configured to reduce sulfur emissions of a diesel engine compared to Diesel Number 1 fuel or Diesel Number 2 fuel; or is configured to lubricate a diesel engine and various working parts of the diesel engine equally or better than an other diesel engine and various working parts of the other diesel engine lubricated with Diesel Number 1 fuel or Diesel Number 2 fuel. The hybrid fuel mixture has excellent lubricity properties. The hybrid fuel is less expensive to produce than biodiesel and its production produces a minimum of environmentally unattractive by-products. The composition provides a hybrid diesel fuel that is obtainable from waste and/or virgin vegetable and animal sources and incorporating of petrochemical diesel feedstock; provides a fuel that can be utilized in standard diesel engines, without further modification of the engines; provides a fuel that is less polluting than commercial diesel fuels in engine or burner use; provides mechanical lubricant for diesel engines derived from waste biosynthetic oils of plant or animal origin; provides a more environmentally friendly and lower cost alternative to diesel and biodiesel fuels. The mixture mix well and burn efficiently in diesel engines. When tested, there is neither significant loss of engine power or engine torque, nor is there abnormal engine wear, compared to Diesel Number 2. Partly because of lower sulfur content, the hybrid fuel is less polluting than petroleum diesel fuels. The hybrid mixtures can function under extreme weather conditions. The composition act as a lubricant of diesel engines which run more quietly, maintain horsepower, and increase fuel economy because of less frictional loss; and provides cleaner burning, more efficient, more cost-effective fuel for diesel engines and other applications.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) preparation (M1) of the fuel composition for use with diesel engines involving: forming a mixture comprising the petrochemical fuel (0-100%), biosynthetic oil and stabilizer mixture (0.001-0.5 vol.%); and    (2) forming (M2) the fuel composition involving: heating a biosynthetic oil to a first temperature; preparing a mixture comprising stabilizer mixture, petroleum-based fuel and the biosynthetic oil; stirring the mixture; cooling the mixture to a second temperature; permitting the mixture to settle for a predetermined time period to form a product mixture; and filtering the product mixture.