What Type Of Oil For 4.3 Mercruiser [Updated April 2024] ❤️


What Type Of Oil For 4.3 Mercruiser: Maintaining the 4.3 MerCruiser engine running smoothly and with a high level of reliability requires regular oil changes. 

But what kind of oil do you need to use? What amount of oil can your engine have? What kind of oil filter do you require?


I’ll address each of these queries and many more. I’ll also discuss the cost of changing your oil with an expert.

Engine Oil Capacity: The oil capacity for MerCruiser 4.3  engine is 5.7 quarts, including both the engine pan and the oil inside the filter.


Type Of Oil: The optimal oil for the 4.3 MerCruiser engine is 25W-40 marine-grade oil, designed to withstand the rigors of boating, including saltwater and high temperatures.

Oil Filter: The recommended filter for the 4.3 MerCruiser engine is the Mercury/Quicksilver 8M00015418, engineered to block contaminants and protect your engine.

Oil Change Cost: The cost of a professional oil change can fluctuate based on location and service provider, typically ranging from $100 to $150.

Mercruiser 4.3 oil type and capacity

Mercruiser 4.3 oil type and capacity

The most recommended oil for the Mercruiser 4.3 engine is marine synthetic blend oil 25W-40 of marine.

The engine’s capacity for oil in this model may vary according to the year and model however, it’s generally about 4.5 five Quarts (4.3 to 4.7 Liters) including the filter.

Always consult the owner’s manual or a certified Mercruiser technician to get specific details regarding your engine.

Mercruiser 4.3 Horsepower

The horsepower rating of Mercruiser 4.3 engines isn’t uniform across all units. Instead, it varies based on factors like the model year and configuration [1, 2]. Here’s a breakdown of some common variations:

  1. Mercruiser 4.3L (190 hp): This version is frequently encountered and offers sufficient power for smaller vessels.

  2. Mercruiser 4.3L MPI (220 hp): Featuring Multi-Point Fuel Injection, this variant delivers enhanced performance and efficiency compared to its carbureted counterpart.

Additional horsepower variations may exist depending on specific model years and optional features.

To determine the exact horsepower of your Mercruiser 4.3 engine, consider these resources:

  • Owner’s Manual: This is the most dependable source, providing precise model and horsepower details.
  • Engine Serial Number: Utilize the engine serial number to access online specifications. Websites like Mercury Marine may offer a serial number lookup tool, or consult parts suppliers for information.
  • Marine Mechanic: A certified marine mechanic can visually inspect your engine to identify its model and horsepower.

4.3 Mercruiser oil filter

The oil filter of the Mercruiser 4.3 engine may differ based on the year of manufacture and the configuration of the motor.

Some of the common oil filter parts that work with this engine include Mercruiser 35-802885Q 35-866340K01, and 35-8M0065104.

To receive particular information about your car and make sure you are using the right oil filter for your model, always check the owner’s handbook and a licensed Mercruiser mechanic.

what type of oil for 4.3 mercruise


4.3 Mercruiser Oil Change

  1. It is essential to warm engines for just a few minutes. This will let the oil flow more easily.
  2. Place the pan to drain oil under the drain plug. The plug that drains oil is situated on the right side of the pan which is at the bottom.
  3. Use a socket or wrench wrench to pull out your drain pipe. Be careful since it is likely that the fluid is probably to be hot.
  4. Let the oil drain into the drain pan.
  5. Once the oil has gone, take out your drain plug. Make sure you tighten it using a wrench, socket or the wrench.
  6. Clean the filter and replace it Be careful because this may have been hot.
  7. Apply a thin coating of fresh oil on the gasket of the new oil filter.
  8. Then, tighten the filter by hand until it’s secure in place.
  9. The cap that covers the oil filler has to be removed. The cap that fills with oil is located on top of the cap which covers the valve for the engine.
  10. Use this funnel to add oil in your vehicle.
  11. Replace the cap that is used to hold the oil.
  12. Start the motor and let it run for about a couple of minutes.
  13. Verify the amount of oil and then add more oil if needed.

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The right oil to use on the 4.3 Mercruiser engine is essential to ensure proper engine operation and long-term durability.

Choosing the correct oil is vital, and it involves considering several factors, including the instructions in the owner’s manual, viscosity, additives, and other relevant aspects.

Good quality oils can provide many advantages, including improved engine performance, a longer lifespan, and greater fuel efficiency.

For more information visit their official website at

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FAQs – What type of oil for 4.3 Mercruiser

What kind of oil do you put in a MerCruiser?

Recommended Oil. Mercury Marine, the manufacturer of the 4.3L MerCruiser engine, specifies that the owner uses Mercury MerCruiser Full-Synthetic Engine Oil, 20W-40, with an NMMC EC-W rating. This specific oil is recommended by the company for all MerCruiser engines, including the 4.3L.

What lubricants are not covered by the Mercury MerCruiser warranty?

Catalysts damaged by lubricants containing high levels of phosphorus may not be covered by the MerCruiser Limited Warranty. If Mercury MerCruiser Full-Synthetic, 20W-40 oils are not accessible, opt for the following lubricants, arranged by preference.

What type of oil should I use in my vehicle?

Use a high-quality, straight-weight detergent automotive oil as indicated in the operating chart below. Avoid non-detergent oils, multi-viscosity oils (except as specified), non-FC-W-rated synthetic oils, low-quality oils, or oils with solid additives.

Can petrol with alcohol be used in a MerCruiser?

When using alcohol-blended gasoline, regularly check the entire fuel system for leaks. Avoid prolonged storage of fuel in the boat’s tank. To extend valve life in all MerCruiser engines, consider the following recommendations

What oil does a MerCruiser take?

25W40 is recommended for all marine engines. Things to know about this oil: For use in all four-stroke marine engines. This oil is engineering-approved for all marine four-stroke applications including outboard, MerCruiser, high performance, and sterndrive/inboard.

What’s the difference between marine engine oil and regular engine oil?

Marine oil is designed for harsh saltwater conditions. In contrast to automotive oils, marine oil features elevated levels of anti-corrosive additives to shield boats from continual exposure.