Lubricants

Engine Oil

Quicksilver engine oils are of the highest quality oils available on the market. They have been and continue to be tested under the most rigorous conditions and must meet Mercury Marine’s strict standards.

Gas Engines

Although marine engines are similar to automotive engines, they are not the same. Your boat’s engine is put through more stress than your car’s engine. Quicksilver sterndrive and inboard oil outperforms automotive oils in marine applications in three key areas: corrosion, load and heat, and air temperature.

Corrosion Protection

Corrosion Protection

Typical auto oils don’t contain corrosion inhibitors marine engines need to guard against the uniquely harsh environment that marine engines operate in. In the example below, samples have been cut from the actual cylinder walls of marine engines that were run with automotive, typical marine and Quicksilver oil. As you can see, the Quicksilver oil offers the best protection against corrosion.

Load and Heat

Load and Heat

Imagine driving your car at 80 mph while pulling a boat while driving up a 30 degree incline—all the time. That’s the kind of stress your Mercury is under. Automotive oil is simply not designed to withstand the marine environment.

Air Temperature

Automotive engine oils are designed to operate in wider outside air temperature ranges than marine oils. In order to operate as efficiently as possible over these large temperature ranges, automotive oils use viscosity Improvers (VI). This is a bit of an oversimplification, but VI are added so that oil can be as thin as possible while still meeting desired performance characteristics over wide temperature ranges. But VI aren’t necessary in marine engines because it is more beneficial for marine oil to as thick as possible and still operate efficiently.

Simple enough, right? Well, it gets a bit more complicated since a number of marine engine oils on the market today may not be true marine engine oils. There is nothing that prevents a company from taking automotive engine oil and labeling it as marine engine oil.

If you check your sterndrive or inboard owner’s manual, chances are your manufacturer recommends the use of an FCW® certified marine engine oil. FCW certified oil has been approved by the NMMA (National Marine Manufacturers Association) for use in four-stroke marine engines.

FCW certified
FCW catalyst compatible

To help boaters protect their investment and to ensure a positive boating experience, the NMMA and leaders in the marine industry have developed a four-stroke marine oil certification called FCW. Products that have the FCW have met minimum testing and quality standards. There are roughly a dozen tests conducted to review viscosity, corrosion, filter plugging, foaming and aeration. In addition, the oil must successfully pass a 100-hour general performance engine test. Engine manufacturers such as Mercury Marine perform additional tests to ensure that our oils exceed these minimum standards. To learn about the NMMA go to www.NMMA.org.

All Quicksilver four-stroke engine oils are FCW certified by the NMMA.

The following chart outlines the general recommended oils for sterndrive or inboard. Follow the maintenance schedule for your specific engine as outlined in your owner’s manual.

Product Catalyzed Engine Non-Catalyzed Engine

Quicksilver 25W40 Sterndrive/Inboard Oil

Quicksilver 25W40 Sterndrive/Inboard Oil
Not recommended Acceptable

Quicksilver 25W40 Synthetic Blend Sterndrive/Inboard Oil

Quicksilver 25W40 Synthetic Blend Sterndrive/Inboard Oil
Not recommended Recommended

Quicksilver 20W40 Full Synthetic Sterndrive/Inboard Oil

Quicksilver 20W40 Full Synthetic Sterndrive/Inboard Oil
Recommended Acceptable

Quicksilver 25W40 Stern Drive/Inboard Oil

Quicksilver outperforms automotive oils in marine applications because of its specialized additive package designed for marine engines. Continued use of this oil will:

Quicksilver 25W40 Sterndrive/Inboard Oil
  • Provide outstanding wear and corrosion protection which help extend engine life
  • Minimize performance-robbing carbon deposits
  • Maintain peak engine performance and reliability

Meets all stern drive and inboard manufacturers’ warranty requirements and recommendations for use of an FCW® oil.

Quicksilver 25W40 Synthetic Blend Stern Drive/Inboard Oil

Quicksilver outperforms automotive oils in marine applications because of its specialized additive package designed for marine engines. Continued use of this oil will:

Quicksilver 25W40 Synthetic Blend Sterndrive/Inboard Oil
  • Provide outstanding wear and corrosion protection which help extend engine life
  • Minimize performance-robbing carbon deposits
  • Maintain peak engine performance and reliability
  • Reduce oil consumption

Meets all stern drive and inboard manufacturers’ warranty requirements and recommendations for use of an FCW® oil.

Quicksilver 25W40 Full Synthetic Stern Drive/Inboard Oil

Marine engines equipped with catalytic converters have specific oil requirements. Some marine-grade oils on the market contain high levels of phosphorus. Long-term exposure to these oils will damage catalytic converters--which may not be covered by your warranty. Quicksilver Full Synthetic 4-Cycle Stern Drive & Inboard Engine Oil:

Quicksilver 20W40 Full Synthetic Sterndrive/Inboard Oil
  • Contains low levels of phosphorus, reducing potential damage to the catalyst
  • Can be used on any stern drive/inboard engine equipped with or without a catalytic converter
  • Keeps dirt and deposits from settling on metal surfaces
  • Reduces oil consumption, compared to conventional oils
  • Resists thermal breakdown and oxidation
  • Provides exceptional rust protection

Meets all stern drive and inboard manufacturers’ warranty requirements and recommendations for use of an FCW Catalyst Compatible® oil.


Diesel Engines

Quicksilver 15W40 Heavy Duty Diesel Oil

Quicksilver 15W40 Heavy Duty Diesel Oil

Protects better than standard fleet oils. Use of this oil will:

  • Provide outstanding wear and corrosion protection which help extend engine life
  • Control soot, deposits and oil thickening
  • Prevent sludge and varnish deposits Meets or exceeds specifications for:
    CH-4, CG-4, CF-4, CF-2, SJ, SH

Meets or exceeds OEM approvals for:

  • Mercury® non-TDI diesel applications, Volvo® VDS®, Caterpillar® CD/TO-2, Cummins®, Detroit Diesel®, And other diesel engines

Quicksilver 5W30 Full Synthetic TDI Oil

Optimizes engine performance in marine applications because this stable, stay-in-grade formula resists thermal breakdown and oxidation under extreme conditions. Use of this oil will:

Quicksilver 5W30 Full Synthetic TDI Oil
  • Protect anti-pollution systems
  • Increase the life of diesel particulate filters (DPF)
  • Provide outstanding wear and corrosion protection which help extend engine life

For use in Turbocharged Direct Injection (TDI) engines

Meets international ACEA C3 specifications

Meets OEM approvals for:

  • Volkswagen VW 501.00/507.00
  • BMW LL-04
  • Mercedes-Benz MB-Approval 229.51
  • Porsche C30

Marine Grease

Marine Grease

Quicksilver 2-4-C marine grease is a multi-purpose lubricant that withstands extreme friction and won’t break down when mixed with water.

Marine Grease Breakdown

The image on the right shows how Quicksilver 2-4-C maintains its consistency while other greases (shown on the left) break down in the presence of water.

The following chart outlines the general lubrication points and intervals for sterndrive or inboard. Follow the maintenance schedule for your specific engine as outlined in your owner’s manual.

Lubrication Point Intervals for freshwater applications Intervals for saltwater applications
Steering cable and linkages 100 hours or once a year 50 hours or once a year
Throttle and shift cables and linkages 100 hours 50 hours
Remote controls 100 hours or once a year 50 hours or once a year
Grease fittings 100 hours or once every other month 50 hours or once a month
Prop shaft 100 hours or once every four months 50 hours or once every other month
Swivel pin 100 hours or once every four months 50 hours or once every other month
Drive shaft splines 100 hours or once a year 50 hours or once a year
Hinge pins 100 hours or once a year 50 hours or once a year