Arrived on site to perform heating tune up on a 2 2005 lennox units. Client stated no issues but is working from home so will be at her office. Cycled heating on and both units are operational. Found filters dirty and client stated she would order more and replace as she does so every 2-3 months. inspect attic and units. Found black flex ducting used and found both units to have good size returns and airflow. Found upstairs unit to have a big lunch and showed client of findings as this may have been since home was build. Found blower assembly on both units really dirty. Found both blower motors working hard and leaking a lot of oils from over working. Advised both motors are on borrowed time and can fail in future due to condition. Found both secondary motor control out of range for blower motors and recommend replacing before they both fail and heater or ac will not operate. Found both inducer motor almost at max one pulling 1.7 and upstairs pulling 1.5. Rated max on both is 1.75 and