The saying “oil is oil!” no longer applies in our world of vast lubricant options! Understanding lubricant compatibility is key when switching to a new lubricant or simply topping off. This course will teach you the risks of mixing lubricants, help you understand why lubricants are not always compatible, and will cover how to avoid lubricant mixtures. When mixing lubricants is unavoidable, testing should be performed to ensure compatibility. This course explains ASTM D7155, the Standard Practice for Evaluating Compatibility of Mixtures of Turbine Lubricating Oils. TestOil uses this method to give you full confidence in mixing lubricants when necessary. Test your understanding of the course material throughout the course with Check-In questions!