How to Winterize a Malibu Wakesetter 5.7L V8 (Direct Drive) | Full DIY Step-by-Step

It’s that time of year again — putting the Malibu Wakesetter to rest for the winter. In this video, I walk you through a complete winterization process on my 2004 Malibu Wakesetter 5.7L Indmar (310 HP) direct-drive engine, step by step.

This is the ultimate DIY guide for anyone looking to save money, protect their boat, and get it ready for next season the right way. I’ll show you exactly what to do — from draining and replacing fluids to running antifreeze through the block, protecting the engine bay, and stabilizing the fuel.

Here’s what’s covered in detail:
Oil Change: Drain and replace old oil with fresh 15W-40 marine-grade oil and a new oil filter
Cooling System: Flush and fill the block and manifolds with antifreeze
Impeller Replacement: Remove the old impeller and install a new one
Corrosion Protection: Coat the entire engine bay with anti-corrosion spray to prevent rust during storage
Battery Care: Disconnect and prep batteries for long-term storage
Fuel System: Add SeaFoam fuel stabilizer to keep the fuel system clean
Final Wrap-Up: Prep the boat for winter storage — ready for spring start-up

If you’re a Malibu, Indmar, or MerCruiser owner, this step-by-step will help you avoid costly repairs and make sure your engine stays healthy all winter long.

Drop a comment if you do your own winterizing or if you’ve got a trick that makes the process easier!

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