It is important to perform these underhood checks at each fuel fill.

Notice: It is important to check the engine oil regularly and keep it at the proper level. Failure to keep the engine oil at the proper level can cause damage to the engine not covered by the vehicle warranty.

Check the engine oil level and add the proper oil if necessary. See Engine Oil .

Check the engine coolant level and, on CTS-V models, check the intercooler coolant level. Add DEX-COOL® coolant mixture if necessary. See Engine Coolant .

Check the windshield washer fluid level in the windshield washer fluid reservoir and add the proper fluid if necessary.