After an Extended Storage

An engine in storage for an extended period of time (over winter, for example) may accumulate water in the oil pan through normal condensation of moisture (always present in the air) on the cold, internal surfaces of the engine.

Lubricating oil diluted by water cannot provide adequate bearing protection at engine startup leading to serious engine damage. For this reason, Detroit™ recommends replacing the engine lubricating oil and filter after extended storage.