When sourcing oil sensors, you must prioritize measurement accuracy and operating temperature range. For automotive applications, ensure the sensor can withstand temperatures between -40°C and +150°C. Key technical parameters include the output signal type (e.g., 4-20mA, 0-5V, or CAN bus), pressure rating (typically up to 10-50 bar depending on the system), and viscosity range compatibility. For quality assurance, look for sensors utilizing MEMS technology or piezoelectric crystals for long-term stability and resistance to vibration.