Should I Change my Boat’s Oil before Winter Storage?

Yes, you should change your boat’s oil immediately before winter storage. Performing an oil and filter change as part of your winterization routine is a critical step for extending engine life and preventing damage.

According to the provided guide, changing the oil before storage is necessary because:

  • Contaminant Removal: Used engine oil contains combustion contaminants, moisture, and acidic byproducts. If left in the engine over the winter, these substances can attack precision bearing surfaces.
  • Corrosion Protection: Fresh marine-grade oil contains corrosion inhibitors specifically formulated to protect internal components during long periods of inactivity.
  • Improved Maintenance: Draining the old oil while the engine is still warm ensures that suspended contaminants are fully removed. Replacing it with fresh oil and a new filter reduces the risk of failures when you restart the engine in the spring.

For outboard engines, it is also recommended to change the lower unit gear oil, as any water contamination in the gearcase can freeze and crack the housing during the winter.

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