OIL COOLER / FILTER HOUSING IS LEAKING OIL DOWN TRANSMISSION AN ONTO THE EXHAUST. CAUSED SMOKE AND NAUSEOUS FUMES TO ENTER THE CABIN. FIRE HAZARD!!!! NOTICED THE FUMES WHILE DRIVING. INSPECTED THE UNDERCARRIAGE A FOUND OIL LEAKING DOWN TRANSMISSION ONTO THE EXHAUST. INSPECTED ENGINE BAY AND FOUND THE OIL POOLING AROUND THE OIL FILTER/COOLER HOUSING.