I’ve recently been told, while at an engine manufacturers training course, that the typical New England temperature changes over the winter will destroy the additive package in new oil installed when boats are hauled for the winter necessitating a change upon launch in the spring even though the oil was never used. This due solely to condensation inside the motor as the temperature fluctuates. These people are only concerned with maximizing engine longevity and maintaining their reputation, they are not selling oil or oil changes.
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