What is the Best Cutting Oil for Drilling Metal?

Cutting Oils for Drilling Metal
What is the Best Cutting Oil for Drilling Metal?
 

Project Farm tests several products to find the best cutting oil for drilling through both mild and hardened steel, including:

Brand new twist drill bits were used for each product tested. In a recent video on twist drill bits, DeWalt and Bosch did well but using a high quality cutting oil helps a lot.