Mercury Marine Oil Capacity Guide

Mercury Marine Oil Capacity Guide

Mercury Marine Oil Capacity Guide

Mercury Marine Oil

Changing your engine’s oil and gear lube is an essential part of maintaining your Mercury Outboard. For maximum protection and performance, we recommend using Mercury Precision Lubricants. These products are rigorously tested to meet strict standards for performance. All Mercury oils contain specially designed additives to reduce friction, improve performance, and protect against engine wear.

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Table of Contents

Why Choose Mercury Engine Oils?

  • Specially formulated for marine environments.
  • Mercury oil provides 40% more protection than other marine oils.
  • Delivers significantly better protection than NMMA industry minimum.
  • Keeps engines performing their best even when operating at max output.

For 4-Stroke engines, Mercury offers mineral, synthetic blend, and full synthetic formulas. Each formula provides varying levels of protection – mineral is good, synthetic blend is better, and full synthetic is the best. Full synthetic 4-stroke oil has 45% more dispersant, 24% more detergent and 49% more anti-wear additives than the synthetic blend.

Mercury’s line of 2-stroke oils includes the Premium, Premium Plus, and Optimax oils. Premium 2-Stroke oil is a conventional oil manufactured for low- to mid-horsepower outboard engines. Premium Plus and Optimax are synthetic blend oils that provide maximum protection and superior lubrication.

When Should I Change my Outboard’s Oil and Gear Lube?

It is recommended that you change your oil and gear lube at the end of the season. During use, lubricants accumulate moisture, combustion by-products, and other contaminants. Storing your engine with a large amount of these contaminants present can be detrimental. For year-round boaters, gear lube and oil changes should be done annually, or at every 100 hours of use. 

Oil Change Kits Make DIY Maintenance Easy

Routine maintenance doesn’t have to be a hassle. Mercury oil change kits are a great option for DIYers who prefer to get everything they need in  one convenient kit. Oil change kits come with everything you need for a routine oil change, including a new oil filter. In addition to the kit, basic hand tools, an oil extractor pump, and a container for the used oil, will also be needed to complete your oil change. Kits are available based on horsepower and come with instructions printed right on the box.

Mercury Oil Capacity Chart

Please note that the engine oil capacities listed below are approximations directly from Mercury Marine. Check your operation and service manuals for more information for your specific engine.

Click Here to Download a PDF of the below chart.

Mercury 4-Stroke Capacity Chart
Model / HP Year Notes Crankcase Capacity (Qt) Crankcase Capacity (Lt) Oil Change Kit Recommended Oil Gearcase Capacity (oz) Recommended Gear Lube
2.5/3.5 2006+ 0.31 0.29 15/20 HP Carb 25W-40 Oil Change Kit  8M0081914 Mercury 25W-40 Mineral - Quart:  8M0078627, Gallon 8M0078628

OR

Mercury 25W-40 Synthetic Blend - Quart: 8M0078629, Gallon 8M0078630		 6.1 Mercury 80W-90 Premium Gear Lube 858058K01
4/5 /6 1999+ 0.48 0.45 6.8
5 2019 Propane 0.47 0.414 6.6
8 1995-00 232cc 1.05 0.99 6.8
2001-04 323cc 1.05 0.99 6.8
2005+ 209cc 0.84 0.79 10.8
9.9 1995-98 232cc 1.05 0.99 6.8
1999-04 323cc 1.05 0.99 6.8
2005+ 209cc 0.84 0.79 10.8
15 1998-05 323cc 1.05 0.99 6.8
1998-05 323cc (BigFoot) 1.05 0.99 8.8
2005+ 351cc 1.05 0.99 12.8
15-20 2018 EFI 1.1 1.04 15.6
20 2008+ 1.05 0.99 12.5
25 1998-06 498cc, Carb w/BigFoot 3.17 3 25/30 HP EFI 25W-40  8M0081915 14.9
2006+ 492cc EFI 1.9 1.8 11.8
2006+ 492cc EFI w/BigFoot 1.9 1.8 14.9
30 1999-05 747cc 3.17 3 14.9
1999-05 747cc w/BigFoot 3.17 3 22.5
2006+ 492cc EFI 1.9 1.8 11.8
35 2017 Jet 3 2.84 Mercury 25W-40 Mineral - Quart:  8M0078627, Gallon 8M0078628

OR

Mercury 25W-40 Synthetic Blend - Quart: 8M0078629, Gallon 8M0078630		 none
40 1999+ 747cc, 3 Cyl 3.17 3 40/50/60 HP EFI 25W-40 Oil Change Kit  8M0081916 14.9
1999+ 747cc, 3 Cyl w/ BigFoot 3.17 3 22.5
2001+ 996cc, 4 Cyl 3.17 3 14.9
2001+ 996cc, 4 Cyl 3.17 3 24
50 1995-00 935cc, 4 Cyl 3.17 3 14.9
1995-00 935cc, 4 Cyl w/ BigFoot 3.17 3 22.5
2001+ 996cc, 4 Cyl 3.17 3 11.5
2001+ 996cc, 4Cyl w/BigFoot 3.17 3 24
60 2001+ 996cc, 4 Cyl 3.17 3 11.5
2001+ 996cc, 4 Cyl w/ BigFoot 3.17 3 24
75 2000-05 Carbureted 5.58 5 1.7L 75/90/115 HP EFI 25W-40  8M0081917 22.5 Mercury High Performance Gear Lube 8M0222065
2006 EFI, 1B366822 & Below 4.8 4.54 22.5
2006+ EFI, 1B366823 & up 5.28 5 24
90 2000-05 Carbureted 5.28 5 24
2006 EFI, 1B366822 & Below 4.8 4.54 22.5
2006+ EFI, 1B366823 & up 5.28 5 24
115 2001-06 EFI, 1B366822 & Below 5.28 5 Mercury 25W-40 Mineral - Quart:  8M0078627, Gallon 8M0078628

OR

Mercury 25W-40 Synthetic Blend - Quart: 8M0078629, Gallon 8M0078630

24
2016+ ProXS 2.1L 2B225488 & above 5.5 5.2 27.1
2014-17 EFI, 2B094996 & up 5.5 5.2 27.1
75/90/115 2.1L 2014+ 2B0964996 & up 5.5 5.2 27.1
150 2011+ EFI 6.34 6 28.1
135 Verado 2006+ 4 Cyl 6.34 6 32.8
150 2018 Pro XS 6.34 6 32.8
150 Verado 2006+ 4 Cyl 6.34 6 32.8
175 Verado 2006+ 4 Cyl 6.34 6 32.8
200 Verado 2007+ 4 Cyl 6.34 6 32.8
225 2003-06 EFI 6.34 6 39
3.4L V6 2018 4-Stk & Pro XS 7 6.62

V6/V8 4-Stroke Oil Change Kit 8M0187621

 24
4.6 L V8 2018 4-Stk & Pro XS 7 6.62 24.4
200 Verado 2005+ 6 Cyl 7.4 7

200-400HP L6 Verado Oil Change Kit 8M0188359

 32.8
225 Verado 2005+ 6 Cyl 7.4 7 32.8
250 Verado 2005+ 6 Cyl 7.4 7 32.8
275 Verado 2005+ 6 Cyl 7.4 7 32.8
300 Verado 2007+ 6 Cyl 7.4 7 32.8
350 Verado 2015+ 6 Cyl 7.4 7 44
400 Verado 2019+ 6 Cyl 7.4 7 44

Mercury Maintenance Kits: Everything You Need for a Clean Service

Routine oil and gear lube changes are essential — but having the right supplies makes the job easier, faster, and less prone to mistakes. Mercury maintenance kits are designed for DIYers and professional techs alike, giving you the proper components to service your engine correctly.

Whether you’re doing a simple oil change, hitting your 100-hour service, or tackling a 300-hour maintenance interval, these kits help remove the guesswork.

Mercury Oil Change Kits

Perfect for routine oil and filter replacement, these kits bundle the correct amount of engine oil plus a factory-matched oil filter based on your Mercury outboard’s horsepower and configuration.

Use these kits for:

  • Seasonal oil and filter service
  • Annual maintenance
  • 100-hour intervals (when combined with the appropriate service items)
  • Quick DIY jobs without guesswork

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Mercury 100-Hour Service Kits

If you do more than occasional boating, a 100-hour service kit supports a more complete maintenance session. Contents vary by engine, but commonly include service items such as engine oil, oil filter, fuel filters, spark plugs (when applicable), and other routine components recommended at this interval.

Best for:

  • Frequent boaters
  • Rental fleets
  • Seasonal prep and tune-ups
  • Peace of mind before a big trip

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Mercury 300-Hour Service Kits

For deeper periodic maintenance beyond basic oil changes, 300-hour service kits bundle parts and consumables intended for extended service intervals. Contents vary by engine family and may include a full oil and filter set, spark plugs, fuel system components, and other recommended replacements for higher-hour servicing.

Ideal for:

  • Heavy usage boats
  • Commercial applications
  • High-performance outboards
  • Seasonal overhaul maintenance

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Why Buy a Kit Instead of Parts Individually?

Mercury service kits simplify maintenance by:

  • Bundling compatible OEM components matched to your engine
  • Reducing guesswork on quantities and fitment
  • Including everything needed for a specific service interval
  • Saving time compared to ordering parts separately

Quick Tip for DIYers

Always confirm the correct kit using your engine’s model and serial number. Pay special attention to:

  • 4-stroke vs. 2-stroke
  • EFI vs. carbureted
  • Horsepower range
  • Verado / Pro XS / SeaPro variations

If you’re unsure which kit your engine needs, check your owner’s manual or contact our support team — we’re happy to help match you with the right parts.

Maintenance Tips for DIY’ers

  • Gear lube pumps are a great way to make changing your gear lube quicker and easier.
  • After draining your gear lube, inspect it for large metal flakes. Fine metal particles are fine, but larger metal chips can indicate significant damage or wear on internal parts. Gear housing disassembly and inspection is recommended.
  • Drained gear lube should also be inspected for color. If it is milky in color instead of blue/green or brown, then water is getting into your gearcase.
  • For 4-Stroke Outboards, engine oil should be warmed up before drained.
  • Before installing your new oil filter, smear a thin coat of engine oil onto the filter’s rubber gasket.

Want step-by-step instructions for changing your Mercury oubtoard oil? Check out our How to Change the Oil in Your Mercury Outboard Engine guide for all the tools, supplies, and tips you need to keep your engine running smoothly.

Looking for other manufacturer oil capacity guides?

Routine oil and gear lube changes are a DIY-friendly maintenance task to keep your engine running like new. Online resources such as  Mercury Marine’s Official Youtube channel combined with complete oil change kits make this maintenance task easy. If you are unsure which oil is best for your engine, or if you need help finding a replacement oil filter, contact us. Our customer service team can help you find the right products for your outboard.

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