When can Delvac 1 first be used?
You can start using Delvac 1 in new vehicles at any time. Or, you can start using Delvac 1 in an engine with a number of miles already on it. As long as the engine is in good mechanical condition, you can start to get the advantages of Delvac 1 today. Refer to Mobil’s Extended Drain Policy Guide for exceptions (available by calling 1-800-662-4525). You can also use Delvac 1 in an overhauled or rebuilt engine. However, a rebuilt engine may contain swarf or abrasive material inside the engine. In this situation, you would be best served by using a short drain interval on your initial oil fill. Delvac 1 will still work in this situation, but it would be less expensive to use a conventional oil for this first, short-duration change.
