What is correct way to read oilstick on 2008 dts caddy?

SOURCE: 2008 dts caddy blower motor resister location

Your not going to like to hear this , but you'll need to take the dash apart !
Blower Motor Resistor Replacement
Preliminary Procedure

1. Remove the HVAC module. Refer to HVAC Module Assembly Replacement .

1. Drain the cooling system. Refer to Cooling System Draining and Filling .
2. Recover the refrigerant. Refer to Refrigerant Recovery and Recharging .
3. Remove the evaporator tube from the thermal expansion valve. Refer to Air Conditioning Evaporator Hose Assembly Replacement .
4. Remove the heater hoses from the heater core. Refer to Heater Hoses Replacement .
5. Remove the brake pedal bracket assembly. Refer to Brake Pedal Assembly Replacement .
6. Pull back and reposition the carpet.
7. Remove the lower instrument panel (I/P) support brace. Refer to Instrument Panel Center Support Bracket Replacement .
8. Reposition the auxiliary air distribution duct. Refer to Auxiliary Air Distributor Duct Replacement .
9. Remove the instrument panel carrier. Refer to Instrument Panel Carrier Replacement .
10. Disconnect the HVAC module assembly electrical connectors.