What Type Of Oil For 4.3 Mercruiser [Update 2023] ❤️

What Type Of Oil For 4.3 Mercruiser

What Type Of Oil For 4.3 Mercruiser: Mercruiser is an inboard engine produced by the marine engine manufacturer Mercury Marine. Mercruiser manufactures a number of inboard motors of various sizes that vary in performance and purpose.

SAE 20W-40 Mercruiser full synthetic engine oil is the most recommended lubricant for all Mercruiser models ranging from 3 liters to 8.2 liters with high output.

 Defense against Flagship Corrosion

The most technologically advanced corrosion inhibitors beat competitors and all industry norms.
It protects against corrosion and rust in a wet environment and during storage during the off-season.

Superior Wear Protection

Using new advanced additive technology, Mercury provided 33% greater camshaft wear protection than other marine oils based on ASTM D6891’s Test Sequence IV limit for camshaft wear (Versus API SJ-based Marine oils).


Five Liters Mercury 25W-40 Marine Engine oil 8M0089918

1 oil filter OEM 83702K

1 Instruction for Oil Change

Mercruiser 4.3 capacity and oil type

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.

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.

But, some of the common oil filter parts that work with this engine include Mercruiser 35-802885Q and 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.

Types of Oil for a 4.3 Mercruiser Engine

There are three kinds of oil suitable for the 4.3 Mercruiser engine: mineral oil and synthetic blend oil as well as full synthetic.

Mineral Oil

Mineral oil is the very traditional type of oil for engines which has been used for quite a while. It is made up of crude oil and enhanced with additives to improve its performance.

Mineral oils can be the cheapest type of oil, and are readily available. However, it’s not the same as synthetic oils in extreme temperatures or in engines with high performance.

Synthetic Blend Oil

Synthetic blend oil can be described as a mixture of synthetic oil and mineral oil. It has better performance than mineral oil and isn’t as expensive as full synthetic oils. Blend oil made of synthetic is suited to most engine types which include the 4.3 Mercruiser engine.

Full Synthetic Oil

Fully synthetic oil is produced completely from chemical compounds and doesn’t include any oil that is crude. This is by far the most expensive kind of oil however it provides the highest performance, particularly when it comes to extreme temperatures and high-performance engines. Fully synthetic oils are the most sustainable option because it emits less carbon dioxide.

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Choosing the Right Oil for Your 4.3 Mercruiser

When selecting the appropriate engine oil to suit your 4.3 Mercruiser engine, you must consider these factors:

Owner’s Manual Recommendations

The owner’s guidebook for your boat will give you recommendations regarding the kind of oil that you can use to your engine. It is essential to adhere to these recommendations to ensure your engine performs optimally.


Viscosity describes how thick the engine oil is, and is determined by the system of rating. The number of viscosities you require will be based on the conditions you operate in as well as the condition of the engine. Refer to the owner’s manual of your vehicle for the recommended rating for viscosity.


The addition of oil additives to the engine can enhance its performance and also protect against wear and wear and tear. Find an oil that has additives suitable to marine engines, for instance, anti-wear and anti-corrosion additives.

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4.3 Mercruiser Oil Change and Tune-up

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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.

It is crucial to consider a variety of aspects that include the instructions in the owner’s manual along with your viscosity and additives, and other factors when choosing the correct oil.

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

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FAQ 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 unavailable, use the following lubricants, listed in order of recommendation.

What type of oil should I use in my vehicle?

A good-grade, straight-weight detergent automotive oil according to the last row of the operating chart below. NOTE: We do not recommend non-detergent oils, multi-viscosity oils (other than as specified), non-FC-W-rated synthetic oils, low-quality oils, or oils that contain solid additives.

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Can petrol with alcohol be used in a MerCruiser?

If petrol with alcohol must be used, periodically inspect the complete fuel system for leaks, and do not store fuel in the boat’s fuel tank for long periods of time. 3. To increase valve life on all MerCruiser engines, the following recommendations should be considered:

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 has been developed specifically for the most corrosive saltwater conditions. Automotive oils aren’t able to work with the constant corrosive atmosphere as boats do, therefore marine oils are much more robust in concentrations of anti-corrosive additives within their formulations.

What is the most recommended oil kind for a 4.3 Mercruiser engine?

The most recommended oil for the 4.3 Mercruiser engine is marine-grade 25W-40 engine oil which meets API Classification SJ or higher. This oil type is specifically created for marine engines and offers the required protection against corrosion, wear, and other possible engine issues.

Why is it essential to use oil of the highest quality in the 4.3 Mercruiser engine?

It is crucial to use premium oil as it ensures the engines are maintained and protected from harmful toxins. Poor quality oil or one that isn’t specifically designed specifically for marine engines could cause major harm to the engine, and could even void the warranty on your engine.

How often do you need to change the oil in a 4.3 Mercruiser engine?

It is recommended to clean the oil and filter at least once a year at least every hundred hours during operation or whatever occurs first. Regular oil changes are essential for extending the life of your engine and ensuring its dependability.

What is the result if a different type of oil is employed in the 4.3 Mercruiser engine?

The wrong kind of oil, like automotive oil, could result in significant harm to the engine, and may even invalidate your engine warranty. It’s essential to adhere to the specifications for oil recommended by the manufacturer along with the maintenance plan to ensure that your engine is operating smoothly.

Can I make use of the synthetic oils within the engine of my 4.3 Mercruiser engine?

Yes, you can put the synthetic oils for the 4.3 Mercruiser engine as long that it is compatible with the specifications of the manufacturer. Synthetic oil can provide improved performance and security in certain situations, but it can be more costly than regular oil.

What is the best procedure to change the oil in the 4.3 Mercruiser engine?

The correct procedure to change the oil in the 4.3 Mercruiser engine involves draining the old oil and replacing the filter before refilling your engine using the appropriate amount and kind of oil. It is important that you follow the manufacturer’s recommendations for procedures and safety guidelines while changing your oil.

What should I do if discover water leaks from the engine of my 4.3 Mercruiser engine?

If you spot leaks of oil in the 4.3 Mercruiser engine, it’s essential to fix them immediately. Leaks in oil could cause damage to the engine and could cause costly repairs if ignored. Consult a certified technician or dealer to assist in identifying and fixing any leaks of oil from your engine.

Do I have to use additives in the 4.3 Mercruiser engine oil?

It’s usually not necessary to add additives to your 4.3 Mercruiser oil since high-grade marine-grade oil includes the necessary additives to ensure the best protection of your engine. The use of unnecessary additives could cause damage to your engine or invalidate the warranty on your engine, therefore it’s recommended to speak with your manufacturer, or an experienced technician prior to adding any additives to your engine.