Boat Winterization in Appleton, WI

AJ's Mobile Marine

I/O and Inboard Packages

Package One

  • Drain & Flush all water from engine
  • Stabilize fuel
  • Change fuel filter if applicable (add $21)
  • Top off all fluids
  • 4 Cylinders, $175
  • 6 Cylinders, $191
  • 8 Cylinders, $208

Package Two

  • Drain & Flush all water from engine
  • Stabilize fuel
  • Change fuel filter if applicable (add $21)
  • Top off all fluids
  • Change oil & filter
  • Change gear lube or transmission fluid
  • Grease all lube points
  • 4 Cylinders, $348
  • 6 Cylinders, $373
  • 8 Cylinders, $391

Package Three

  • Drain & Flush all water from engine
  • Stabilize fuel
  • Change fuel filter if applicable (add $21)
  • Top off all fluids
  • Change oil & filter
  • Change gear lube or transmission fluid
  • Grease all lube points
  • Pull Drive (check & grease gimbal bearing & u-joints)
  • 4 Cylinders, $461
  • 6 Cylinders, $479
  • 8 Cylinders, $495

Outboard Packages

2 Stroke Outboard winterization Package

  • Stabilize fuel
  • Top off all fluids
  • Grease all lube points
  • Change gear lube
  •  2 Cylinders, $121
  •  3 Cylinders, $129
  •  4 Cylinders, $145
  •  6 Cylinders, $169

4 Stroke Outboard Winterization Package

  • Stabilize fuel
  • Top off all fluids
  • Grease all lube points
  • Change gear lube
  • Change motor oil & filter

*Plus cost of oil @ 16.00/qt

  •  2 Cylinders, $145
  •  3 Cylinders, $150
  •  4 Cylinders, $169
  •  6 Cylinders, $195
  •  8 Cylinders, $215

Winterization Order Form

Why AJ’s Mobile Marine is the Go-To Choice

for Winterizing

Choosing who handles your winterization can make all the difference in your boat’s long-term health. At AJ’s Mobile Marine, we’re more than just technicians—we’re boat owners too. We understand how important it is to protect your investment during the harsh Wisconsin winters.


Our winterizing packages are designed with precision and care, covering everything from fluid changes and fuel stabilization to full inspections and drive removal when needed. We tailor our services based on your engine type and usage history to ensure optimal performance come spring.


With 28+ years of marine service experience and a Better Business Bureau A+ rating, we’ve earned the trust of boaters across the Fox Valley. For reliable, thorough boat winterization in Appleton, WI, we’re the name locals count on. And because we’re mobile, we bring expert service right to your door—saving you time and hassle while protecting your boat.


Order your winterization here

Proper boat winterization is one of the most important steps you can take to protect your vessel from long-term damage. At AJ’s Mobile Marine, we make it easy by offering professional, reliable service that comes directly to your location—saving you time, hassle, and costly repairs down the line. Our experienced team understands the unique demands of Wisconsin winters and takes every precaution to ensure your boat is fully prepared for storage. Whether you’re a seasoned boater or new to ownership, we’re here to help you navigate the winterization process with confidence.


Looking for boat winterization in Appleton, WI? Below are the winterizing packages offered through AJ’s Mobile Marine. By filling out the form below, you are contacting AJ’s Mobile Marine and letting us know that you are interested in one of these packages. You can expect to hear from us within one business day. Please provide as much information as possible; you will receive an error if any required fields are left blank. If the form is successfully submitted, you will see a confirmation message stating: “Thank you for your interest in our Winterizing Package. You can expect us to contact you within one business day.”


We are located in Appleton, Wisconsin, and proudly serve the Fox Valley area, including Oshkosh, Fremont, and Green Bay!

Why Winterizing Your Boat Is Non-Negotiable

When temperatures drop, your boat’s engine and internal systems are vulnerable to serious damage if left unprotected. Freezing temperatures can crack engine blocks, destroy seals, and corrode internal components. That’s why winterizing your boat isn’t just smart—it’s essential. It protects your investment and saves you from expensive repairs in the spring.


At AJ’s Mobile Marine, we take boat winterizing seriously. Our team follows a meticulous process to ensure your fuel system, engine, fluids, and other components are properly prepared for the off-season. Skipping even one part of this process can result in long-term damage, which is why it’s so important to trust experienced professionals.


We make boat winterization in Appleton, WI convenient and stress-free with mobile service and transparent pricing. Whether you’re a weekend boater or a full-season angler, prepping your boat for winter is the best way to ensure a smooth launch next season. Don’t risk it—protect your boat before the cold hits.


What Happens If You Skip Winterization?

Neglecting winterization may seem like a shortcut, but it can lead to long-term headaches and high repair costs. When boats aren’t properly winterized, leftover water in the engine block, cooling system, or lower unit can freeze and expand. This often results in cracked blocks, broken seals, and internal corrosion—issues that are not only expensive but sometimes irreversible.


Fuel systems can also suffer. Without stabilizer, fuel breaks down over the winter, leading to gummed-up injectors, clogged lines, and carburetor issues that make starting the engine in spring a challenge. Even electrical systems and batteries can degrade without proper maintenance.


If you’ve ever dealt with post-winter engine problems, you know how frustrating and costly they can be. That’s why so many boat owners trust AJ’s Mobile Marine for boat winterization in Appleton, WI. We take the guesswork out of the process and ensure your boat is properly prepared for storage—so you can avoid unnecessary repairs and get back on the water faster.


Benefits of Professional Winterization vs. DIY

While it’s tempting to attempt boat winterization on your own, there’s a lot that can go wrong without the proper tools, experience, and attention to detail. DIY winterization often misses critical steps like fully draining water from internal components, checking seals, or greasing lube points—oversights that can cause serious engine damage.


By choosing a professional like AJ’s Mobile Marine, you get peace of mind knowing the job is done right. Our team has over 28 years of marine repair experience, and we follow manufacturer-recommended procedures to prepare your boat for winter the right way. We offer full-service packages for I/O, inboard, and outboard engines to suit any need or budget.


When it comes to boat winterization in Appleton, WI, no one offers more convenience or expertise than AJ’s. We bring the service to your driveway or dock, eliminating the need for transport and saving you time. With us, your boat gets the protection it deserves—with zero stress.

When Should You Schedule Your Winterization Service?

Timing is everything when it comes to winterizing your boat. The ideal time to schedule your service is before the first hard freeze—but availability can fill up fast during peak season. That’s why we recommend booking your appointment early to avoid delays and ensure your boat is fully protected before temperatures drop.



If you wait too long, your boat may be exposed to freezing temperatures without protection, increasing the risk of serious engine and system damage. Even if you're still using your boat later in the fall, you can pre-book your service and lock in your spot.


At AJ’s Mobile Marine, we make scheduling easy and flexible. Simply fill out the request form and we’ll contact you within one business day to confirm your appointment. As the trusted source for boat winterization in Appleton, WI, we help you plan ahead so you’re never caught off guard by the cold.