The best four-stroke engine oil not only protects your vehicle’s engine but also helps your car run more smoothly.
We researched and tested dozens of options, evaluating them on performance, quality, and value. Our top choice, YamaLube All Purpose 4 Four Stroke Oil, offers maximum protection and performance.
Here is the best four-stroke engine oil.
Best Four Stroke Engine Oil: Editor Recommended
Our Editor’s Best Four Stroke Engine Oil Reviews
- Genuine OEM Yamaha
- 1-Quart Plastic Easy-Pour Container
- Yamalube 10W-30 4M Outboard Mineral FC-W Engine Oil
- 1-Quart Bottle
- High Quality formual engineered specifically for small engines
- All season formula designed for operation in broad temperature ranges
- Zinc boosters reduce engine wear to extend engine life
- Optimized for use in Kohler and Honda Applications
- Engineered with Anti-Wear Technology that provides engine part lubrication and reduced engine wear
- All-weather synthetic blend formula promotes easier starts all year
- Antioxidants fight thermal breakdown to enhance oil durability
- Viscosity index improver helps reduce oil consumption
- Detergents help keep engine components clean and control carbon deposits
- Provides Outstanding piston cleanliness to help prevent deposits and ring sticking
- Excellent camshaft wear protection for long engine life
- Recommended in gasoline applications requiring API SN, JASO MA2 engine oil
- Full Synesthetic High Performance 0W-40 Four Stroke Engine Oil, 1 Quart, Silver
- Off Road Formulation- Suitable for ATV, UTV, & Dirt Bike Applications
- To be used in extreme cold environments
- Meets API SM & JASO MA Specifications
- Designed for use in wet clutch applications
- SKU: 92-8M0078630
- Sold Each
- Please verify your own fitment
- Semi-Synthetic 5W-30 4-Stroke Oil
- For most 2-stage 4-stroke snow blowers
- Superior cold temperature performance
- Exceeds API SJ specifications
- High quality SAE30 oil
- Specially formulated for higher operating temperatures of air cooled engines
- This OEM oil ensures proper fit and performance to maintain the life of your Briggs and Stratton equipment
- Genuine OEM Toro product
- 32 oz bottle
- Premium 4-Cycle Engine Oil
Best Four Stroke Engine Oil Buying Guide
1. By Application: The first step is to determine the application of the engine you are choosing from by looking at the following points:
a. Air-cooled or water-cooled: An air-cooled engine is one whose cooling system is not immersed in liquid. These are the most widely used two-stroke engines and are generally found in small-scale applications. Water-cooled engines are the ones that are immersed in liquid and heat is dissipated through the liquid.
b. Stationary or portable: The next step is to determine whether the engine you are choosing is meant for stationary or portable use. The difference lies in the mounting points of the engine.
A portable engine has mounting points that are designed to allow it to be transported easily. On the other hand, the stationary engine has no such points, which means it cannot be moved.
c. High- or low-power: The next step is to determine the intended use of the engine so that you can choose one that meets your requirements.
If it will be used for heavy-duty applications, you need to choose an engine that is more powerful. On the other hand, if it will be used in light-duty applications, you can choose a smaller engine.
d. Single- or multiple-cylinder: If you are choosing a multiple-cylinder engine, it is important to determine the number of cylinders and their configuration.
An engine can have either in-line or opposed configurations. An in-line configuration has the cylinders aligned along a single axis, while in an opposed configuration, the cylinders are arranged in a V shape.
e. Reciprocating or rotary: The next step is to determine the type of motion of the engine you are choosing. A reciprocating engine, also known as a ‘piston’ engine is the most common type of engine.
It has a crankshaft at the center with connecting rods and a connecting rod with a piston. On the other hand, a rotary engine is one where the crankshaft is fixed with the engine housing.
There are two types of rotary engines: single-phase and two-phase. In a single-phase rotary engine, there is only one single rotor, while in a two-phase rotary engine there are two rotors and they rotate in opposite directions.
What else you should know about the best four-stroke engine oil
1. What are the benefits of using a four-stroke engine oil?
Four-stroke engine oil is designed to lubricate the engine, protect it from corrosion, and help to keep it clean. It also helps to improve fuel economy and reduce emissions.
2. What are the best brands of four-stroke engine oil?
The best brands of four-stroke engine oil include Castrol, Valvoline, and Mobil 1.
3. What are the differences between four-stroke engine oils?
The main difference between four-stroke engine oils is their viscosity or thickness. Thicker oils provide more protection for engine parts, while thinner oils allow the engine to run more efficiently.
4. How do I choose the best four-stroke engine oil for my vehicle?
The best four-stroke engine oil for your vehicle is determined by the manufacturer’s specifications.
5. What are the most common problems associated with four-stroke engine oils?
The most common problems associated with four-stroke engine oils are poor lubrication, sludge build-up, and oil leaks.
On the market, there is numerous best four-stroke engine oil. Hopefully, the list of the top ten best four-stroke engine oil will save you time researching and deciding on the best one for you.