Abstract: A sediment basin and baffle combination for internal combustion engines, which combination includes a sediment basin in the bottom of the engine oil pan for accumulating sediment and contaminants from the engine oil and a baffle positioned over the sediment basin for limiting re-entry of the accumulated sediment back into the oil reservoir from the sediment basin. In a preferred embodiment the baffle includes a baffle grid constructed from one or more layers of elongated baffle elements, each having a triangular-shaped cross-section. Each baffle element is oriented in the baffle grid with a triangle apex of each baffle element facing upwardly to promote drainage of sediment and contaminant deposits through the grid, into the sediment basin and a triangle base of each baffle element facing downwardly toward the sediment basin to retard sediment and contaminant re-entry into the oil.