100 Hour Boat Service
Keep your engine running strong with a professional 100 hour boat service.
Ethan, the owner and mechanic, answers the phone · Open 7 days a week
- Same / next day availability
- On-site & marina service
What Is a 100 Hour Boat Service?
A 100 hour boat service is the first major maintenance interval for most outboard and inboard engines. Most manufacturers recommend completing it every 100 engine hours or at least once per year, whichever comes first. Not sure if yours is due? Check with the boat service due checker.
It’s designed to:
- Replace critical fluids
- Inspect wear components
- Prevent corrosion and system failure
- Catch small issues before they become expensive repairs
Trusted by boat owners across South Florida
Read our Google reviewsNo call center. No front desk.
When You Call, the Owner Picks Up
Every call goes straight to Ethan, the owner of EG Marine Services and the mechanic who does the work. There’s no receptionist taking a message and no waiting on a callback from someone who’s never seen your boat.
Tell him what’s going on: the alarm on the display, the noise at idle, the engine that won’t turn over. Ethan knows Yamaha, Suzuki, Mercury, and the rest of what runs in South Florida inside and out, so you’ll usually get a straight answer on the first call, whether that’s something you can check yourself or a visit to your dock.
- Straight answers, not a script
- Diagnostic questions answered on the phone
- Honest advice, even when the fix is simple
- The person you talk to is the one who shows up
Ethan
Marine mechanic
Describe what the boat is doing and get a real answer from the mechanic, not a message taker.
Call Ethan: 786-351-5363Open 7 days a week
Coming up on 100 hours? Call Ethan and get it on the schedule.
Call 786-351-5363Why the 100 Hour Service Matters
Boat engines operate under constant load, high humidity, and often in saltwater. This environment accelerates wear compared to automotive engines. A routine 100 hour service helps protect your engine, extend its lifespan, and avoid unexpected breakdowns on the water.
Without proper servicing:
- Engine oil breaks down and loses protection
- Gear lube can become contaminated with water
- Fuel systems develop blockages or inefficiencies
- Corrosion spreads through electrical and metal components
Our 100 Hour Service Process
We keep everything clear, efficient, and professional.
- 01
Initial Assessment
We review engine hours, condition, and service history.
- 02
Full Service Execution
We complete all required maintenance based on manufacturer guidelines.
- 03
System Checks & Inspection
We inspect critical components and identify any potential issues.
- 04
Final Testing
We ensure everything is running properly before returning your boat.
What’s Included in Our 100 Hour Service
We follow a detailed process to ensure your engine and systems are fully checked and maintained.
Engine Oil & Filter Change
- Drain and replace engine oil
- Install new oil filter
- Inspect for contamination or abnormal wear
Lower Unit Gear Lube Service
- Drain and inspect gear lube
- Check for water intrusion or metal particles
- Refill with manufacturer-recommended lubricant
Fuel System Service
- Replace engine fuel filters
- Replace water-separating fuel filter
- Inspect fuel lines, connections, and primer bulb
Spark Plug Inspection / Replacement
- Inspect spark plugs for wear and deposits
- Replace if needed
- Ensure proper ignition performance
Propeller & Prop Shaft Service
- Remove and inspect propeller
- Check for fishing line or seal damage
- Grease shaft and reinstall properly
Cooling System Inspection
- Check water flow and temperature performance
- Inspect water pump condition
- Identify early signs of overheating risk
Electrical System Check
- Inspect battery condition and connections
- Check wiring, grounds, and connectors
- Apply corrosion protection where needed
Anodes & Corrosion Protection
- Inspect sacrificial anodes (zinc replacement)
- Replace if worn (typically around 50%)
- Ensure proper contact and protection
General Engine Inspection
- Check for leaks, corrosion, or loose components
- Inspect hoses, clamps, and connections
- Identify potential issues early
Why Choose EG Marine for Your 100 Hour Service
Not all 100 hour boat service providers deliver the same level of detail.
Thorough, Not Rushed
We don’t just check boxes. We inspect, test, and verify everything.
On-Site Convenience Available
We can service your boat at your dock, marina, or location when possible.
Preventative Approach
We focus on catching issues early to avoid major repairs later.
Clear Communication
You’ll know exactly what was done and what your engine needs next.
From the Job Log
Outboard oil change with Quicksilver four stroke oil on a boat lift 
Worn spark plugs removed during an outboard service 
Outboard lower unit gear oil drained and checked 
Boat lifted from a dry stack rack
Schedule Your 100 Hour Boat Service Today
Stay ahead of maintenance and keep your boat performing at its best.
Call Ethan directly786-351-5363Open 7 days a week · No call center or front desk, you talk to the person doing the work
- Flexible scheduling
- Experienced marine technicians
- Service at your location or marina
Prefer a free quote?
Leave your number and we’ll call you back.
100 Hour Boat Service FAQs
Do I still need a 100 hour service if I don’t use my boat often?
Yes. Even if you’re not hitting 100 hours, engines still accumulate wear from sitting, especially in humid or saltwater environments. Fluids absorb moisture, fuel can degrade, and corrosion can develop. That’s why this service is also recommended yearly, regardless of usage.
What’s the difference between a basic tune-up and a 100 hour service?
A basic tune-up typically focuses on a few visible components like spark plugs or filters. A 100 hour boat service is much more comprehensive: it includes fluid changes, system inspections, and preventative checks across multiple areas of the engine to ensure everything is operating correctly, not just the obvious parts.
Will this service improve my boat’s performance?
In many cases, yes. Fresh oil, clean filters, properly functioning spark plugs, and a serviced fuel system all contribute to smoother operation, better fuel efficiency, and more reliable starts. If your boat has been feeling sluggish, this service often restores performance.
Can this be done at my dock or marina?
In most cases, yes. We provide on-site service when access and conditions allow it. This saves you the hassle of transporting your boat and makes it easier to stay on top of routine maintenance.
Areas We Serve
Our mobile marine mechanics travel to marinas, private docks, and waterfront homes from Boca Raton to Islamorada. Nearby but not listed? Reach out to confirm availability in your area.