What is included in a 100-hour service for my boat engine?

A 100-hour service covers engine oil and oil filter, fuel filters and water separator, the raw-water impeller (inspected or replaced), lower unit gear lube or transmission fluid, zinc anodes and, on gasoline engines, spark plugs, plus a fault-code scan on EFI engines, a check of belts, hoses and electrical connections, and a test run. The exact list follows your engine maker's schedule, and parts are itemized in your written estimate.

Why is annual engine maintenance important?

Annual maintenance lowers the risk of a breakdown on the water and helps the engine last. Oil, impellers and anodes wear even when the boat sits, and regular checks catch small problems before they become costly repairs.

Do you perform inspections on all engine components?

We check the fuel, cooling, lubrication and electrical systems from the outside for wear, corrosion and leaks, and scan EFI engines for stored fault codes. It is a maintenance check, not an internal engine inspection; anything that needs attention is reported to you with a price before any work.

How often should I schedule a 100-hour service?

Most engine makers call for it every 100 operating hours or once a year, whichever comes first; your owner's manual has the exact schedule for your engine. Boats in heavy use or salt water may need some items checked more often.

Do you provide a maintenance report after the service?

Yes. After the service you get a written record of everything inspected and replaced, plus our recommendations, to track engine health. Keep it with your records: maintenance by an independent shop does not by itself void the engine warranty, but coverage decisions are made by the engine maker.

Can regular maintenance improve engine performance?

It keeps an engine running as it should: fresh oil, clean fuel filters, a good impeller and correct plugs help it start easily, run smoothly and hold its temperature. Maintenance will not add power beyond what the engine was built for, but it lowers the risk of breakdowns and helps the engine last.

Breeze Marine technician carefully removing an oil filter from a large white Yamaha outboard motor

Breeze Marine technician carefully removing an oil filter from a large white Yamaha outboard motor (2)

100-Hour Service & Annual Engine Maintenance

The core of marine engine care. Many engine makers call for this service every 100 hours or once a year, whichever comes first. We change fluids, filters and impellers to help prevent breakdowns during the season.

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$150 /hr

Labor estimate Usually 2–4 hours

Book sends us a ticket; nothing is charged online. Before any work you get a written estimate for labor, parts and the trip fee, and nothing is done without your OK.

Trip fee By distance, one way: $30 in San Pedro, $50 in Long Beach

San Pedro$30
Wilmington, Terminal Island$40
Long Beach: Shoreline, Rainbow Harbor$50
Long Beach Marina, Alamitos Bay$60
Redondo Beach$60
Seal Beach, Huntington Harbour$75
Marina del Rey$85
Newport Beach$110

Farther away: $25 plus $2.50 a mile, one way from our San Pedro shop. No trip fee when the boat comes to our shop, or for plan members. The work of a visit is at least $150; the trip fee is on top.

Registered in California: Breeze Marine Boat Service LLC, San Pedro
Where we work: At your slip from Marina del Rey to Newport Beach, or in our San Pedro shop
Questions first: (213) 693-0224 or submit a ticket

About this service

Preventative Care

Engine Care.
On Schedule.

The 100-hour service is the core maintenance item for most boat engines. We follow the maker's service schedule and specifications and give you dated, itemized receipts, which help if you ever make a warranty claim.

Fluids & Filters

We replace engine oil, oil filters, and the fuel filter and water separator elements (such as Racor) using products that meet the maker's specifications, to protect internal components from wear and corrosion.

Cooling System

The water pump impeller is your engine's lifeline. We inspect or replace it annually to prevent overheating, especially in saltwater environments.

Drive Train

We drain and refill the lower unit gear lube (outboards and sterndrives) or transmission fluid, inspecting the old fluid for metal shavings or water intrusion.

Service Procedure.

No shortcuts. Just clean, documented maintenance.

Scan

On EFI engines, we connect a diagnostic tool to check engine hours and scan for any stored fault codes before we begin.

Drain

We drain the old oil while the engine is warm, so it flows better and carries more contaminants out of the sump.

Replace

We install new filters, impellers, and zinc anodes, lubricating seals to ensure proper seating.

Test

We run the engine to verify oil pressure, cooling temperature, and check for leaks before signing off.

Ready for the Season.

Serviced, tested and documented.

Technician changing the oil filter during a 100-hour service

New fuel filters next to old ones from annual maintenance

Brands We Service.

Professional maintenance for the engines you trust.

Yamaha Outboards

Mercury Verado & SeaPro

Volvo Penta Gas & Diesel Inboards

Common Questions

Do I really need this every year?

Yes. Even if you don't hit 100 hours, engine oil degrades over time and collects moisture. Saltwater impellers can take a "set" and become brittle if left sitting.

Will this void my warranty?

Not automatically. Under federal law (the Magnuson-Moss Warranty Act), maintenance by an independent shop does not by itself void your engine warranty. We use parts and fluids that meet the manufacturer's specifications and give you detailed receipts for your records; warranty decisions are made by the manufacturer.

Book Your Service.

Avoid the summer rush. Schedule your annual maintenance today.

Schedule 100-Hour Service

Planning Your Annual Boat Engine Maintenance

Boat engine maintenance is easiest to keep on track with a simple rule: every 100 hours or once a year, whichever comes first, unless your engine maker's schedule says otherwise. Even an engine that barely ran this season benefits, because oil collects moisture over time and a saltwater impeller can take a set and turn brittle while it sits.

When you book, have your engine make, model and current hours handy, and mention anything unusual from last season, such as overheating alarms, water in the gear lube or hard starting. On EFI engines we scan for stored fault codes before we begin; we replace oil, filters, impellers and zinc anodes, and run the engine to verify oil pressure, cooling temperature and leaks before signing off. You receive detailed receipts for your maintenance records.

Oil Change or Full 100-Hour Service?

Many owners start by looking for a mobile boat oil change. Fresh oil and new filters are a core part of this service, but oil alone leaves other wear items unchecked. The same visit also covers the fuel separators, water pump impeller, zinc anodes and lower unit gear lube or transmission fluid, followed by a test run for oil pressure, cooling temperature and leaks.