Winterize Your Boat
Prep your boat for the offseason with Sierra filters, oils, fuel water separators and more
Parts Finder
Search by model, manufacturer, serial number, OEM, and more. The SIERRA brand encompasses the full SIERRA Marine product lines, as well as expansive marine brands formerly known as Shields and Moeller.
Engine & Drive
Oils & Lubes
Free Sierra eGuard Treatment with any Purchase $75 and more
Bottled in easy-to-use precision measuring package. Cleans fuel system and improves performance. Contains a non-alcohol water remover that helps to reduce the chance of phase separation. Prevents fuel system corrosion from water attracted by E10 fuels, and prevents gum and varnish formation for optimum performance and quick starts. Safe for use in all gasoline powered engines including generators and outdoor power equipment, and in both 2-cycle and 4-cycle engines. Stabilizes E10 gasoline for up to 12 months.
Oil Change Kits
Fuel Water Separators
10 Winterization Tips for a Trouble-Free Spring
Properly storing and winterizing your boat in the fall means you’re more likely to avoid costly repairs down the road. The last thing you want to experience on the first warm day on the water is damage that could have been prevented with some basic boat maintenance. Following a winter maintenance plan will help keep your boat in good condition and ready to use after being stored for an extended period. Here are 10 tips from our Sierra experts to help you winterize your boat.
58 Years of Sierra
SIERRA has a 58-year history as a leading global manufacturer of aftermarket engine and drive parts for the marine industry. The SIERRA brand encompasses the full SIERRA Marine product lines, as well as expansive marine brands formerly known as Shields and Moeller.
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