Best 4 Stroke Oil For Your Powerful Engine

Motor oil is the blood of any engine, lubricating clutches, and gearboxes so that components work without obstacles. It’s hard to find the best 4-stroke oil for a particular type of vehicle since thousands of models are on sale in automotive stores. That’s why this review was created to address driver concerns.

The oil lines below are from reputable brands with consistent quality that many customers trusts. We will break down the lubricants’ characteristics, pros, and cons, so you can choose the most suitable one. Some frequently asked questions will also be compiled and answered. Please patiently scroll to the bottom of the page!

Best 4 Stroke Oil Review

#1 Best Overall: Maxima Premium4 10W-40 Motorcycle Engine Oil 

Maxima Premium4 10W-40 Motorcycle Engine Oil 


  • Affordable price and big volume
  • Come with anti-scuff and anti-wear additives to resist extreme temperatures and loads
  • Well-certified: JASO-MA M/C 4T, API SG/CC, and Turbo
  • Stable viscosity


  • Some complaints about container leakage


  • Viscosity: 10w-40
  • Vehicle Service Type: Motorcycle
  • Liquid Volume: 128 Fluid Ounces

Ranked as the best overall, Maxima Premium 4 oil from the USA exhibits many excellent characteristics. This petroleum-based oil is refined from advanced additives, typically anti-wear and anti-cutting agents. 

The product makes its moments on 4-stroke engines with integrated gearboxes and uses water/air for the cooling system.

The oil can provide the engine with the most robust performance for ordinary motorbikes. How about large displacement ones? Perhaps you do not know Maxima is a brand born and inspired by powerful racing motorcycles. 

Here, Maxima oil is engineered with anti-scratch additives, in charge of resisting large loads, high temperatures, or fast speeds. We ensure that the performance of large displacement motorcycles will still be maintained, serving racers completely.

When starting the journey, you will quickly feel the smoothness thanks to Maxima’sMaxima’s exclusive advanced formula. The key is to reduce friction and limit temperature increase.

#2 Runner Up: Royal Purple 1315 06315 Max-Cycle SAE 10W-40 High-Performance Motor Oil

Royal Purple 1315 06315 Max-Cycle SAE 10W-40 High-Performance Motor Oil


  • High compatibility for wet clutch
  • Shear stability for better performance
  • Reduce corrosion and rust
  • Less power loss and overheating


  • High price compared to the volume
  • Some complaints about flushing times


  • Viscosity: 10W-40
  • Liquid Volume: 32 Fluid Ounces
  • Vehicle Service Type: Motorcycle

If you are passionate about items for your motorbike, you are no stranger to Royal Purple – one of the popular brands in the US and worldwide.

The brightest selling point is the exclusive Synerlec technology from Royal Purple, which stimulates each oil molecule. This technology creates high-strength ionic bonds with the metal surface to improve the response between the lubricant, temperature, and pressure. 

Thanks to Synerlec technology, this lubricant exhibits outstanding load-carrying capacity.

Synerlec technology also improves film strength. It fosters combustion to release more energy, optimizes fuel economy, and reduces exhaust. The higher the strength, the less the piston scuffing and wear risk.

#3 Best for ATV: HONDA 08C35-A141L01 Honda Pro GN4 Motor Oil

HONDA 08C35-A141L01 Honda Pro GN4 Motor Oil


  • Stable and certain clutch performance
  • Suitable for all terrains, especially rough ground
  • Affordable price


  • Some complaints about gas mileage


  • Viscosity: 10W- 40
  • Vehicle Service Type: ATV
  • Liquid Volume: 128 Fluid Ounces

It is not an exaggeration to say that the HONDA GN4 is one of the pioneers of lubricant products for motorbikes, especially for ATVs. Some later manufacturers have followed the standards of GN4 for their lubricant products.

Towards all-terrain vehicles, each oil component’s quality is carefully vetted. The purest and most active base oils have been selected, complemented by a dedicated additive package. The base oil and chemical additives work together to create a tight protection mechanism.

Lubricating film strength is designed to reduce the effects of friction and control wear by other means besides the film. Film strength is perfectly maintained even with higher loads and temperatures and relatively lower surface velocities.

Shear resistance, viscosity stability, and cleanliness are the three most focused features and the most appreciated by users. This item shines its best on dirt bikes which usually conquer rough ground.

#4 Best For Vehicle Expectancy: Castrol 6146 GTX 10W-40 Motor Oil

Castrol 6146 GTX 10W-40 Motor Oil


  • Stable and durable
  • Reduce friction for more gas mileage
  • Dual-action formula to wash away old sludge


  • Small volume
  • Not highly recommended for ATVs


  • Viscosity: 10W- 40
  • Liquid Volume: 32 Fluid Ounces
  • Vehicle Service Type: Automobiles

Quite a few cases of poor-quality lubricants are not able to protect the engine. Then, Castrol GTX 6616 oil is the solution.

Modern motors often have to transmit much power to surrounding components, leading to overheating and significant pressure. That’s why you detect deposits and wear in the engine.

Mentioning Castrol, we remind you of the advanced TriShield technology that has been engineered in most of the brand’s products. This is a 3-action technology that eliminates scale accumulation while preventing thermal and viscosity breakdown.

 The brand has focused on minimizing friction. Thus, the lubricant not only reduces heat generated between the contact surfaces but also strengthens power mileage and limits wear as much as possible. The engine runs smoothly, maintaining the integrity of your ride.

With consistent performance, you can consider Castrol as a long-term choice for your on-road motorcycles.

#5 Best Versatile: YamaLube All Purpose 4 Four Stroke Oil

YamaLube All Purpose 4 Four Stroke Oil


  • Affordable price
  • Safe for wet clutch application
  • Used for many motorcycle types
  • Reduce friction to help the engine last longer


  • The containers sometimes leak


  • Viscosity: 10w-40
  • Liquid Volume: 128 Fluid Ounces
  • Vehicle Service Type: Many types of motorcycles, scooters, and ATVs

Suppose you are passionate about motorcycles and are looking for a lubricant that can serve your whole collection (all-terrain motorbikes, sport bikes, dirt bikes, motor scooters, or snowmobiles). You’ve stopped at the right point; let’s see the Yamalube OEM Factory Oil.

The high-end mineral-based formula is designed to work in harmony with any motorcycle. Strength focuses on the clutch performance and wear and tear resistance. 

Friction is minimized to protect the motor from wear and tear when riding over different surfaces. Drivers can still feel the smoothness regardless of the high load for off-road performance.

With this assistant, you no longer spend much time choosing the specific type of oil for each motorcycle. Purchase one and apply for all. What a convenience!

FAQ Relate To 4 Stroke Oil 

Is All 4 Cycle Oil The Same?

4-cycle oil, a.k.a 4-stroke oil, is basically a type of lubricant manufactured for 4-stroke engines. We conclude that there is no difference in use and properties between types of 4-cycle oil. 

They are all formulated from base oils – usually petroleum – with specialized additives to reduce the risks of engine high-load operations. Understanding 4-stroke oil correctly and distinguishing it from 2-stroke oil will help you buy more properly.

Can I Use 10W30 Instead Of 4-Cycle Oil?

10W30 is exactly one kind of 4-stroke oil used for motorcycles. The number 10W30 is a parameter representing the oil’s viscosity level. You can come across these various parameters depending on the oil brand and your vehicle’s needs, for example, 20W-40 or 5W40, etc. 

The first parameter can be considered as the viscosity at room temperature. The lower the number, the thinner the oil. And the thinner the oil, the better it maintains gear movement and engine power. 

The most popular parameter is 10W40 (as seen in the list above) since it has a fast oil pump speed, good heat dissipation, and little resistance to the engine.

Can I Use 10/40 Oil In My Lawn Mower?

You can still use 10W40 oil for your lawn mower, but it’s not highly recommended. And there are also very few cases that choose the viscosity level of 10W40 for lawn mowers.

Please understand that a lawn mower is better compatible with low viscosity oils, namely 30. 10W40 has a high viscosity and is quite dilute, interfering with lawn mower engines’ self-lubrication. In the long run, wear and tear can take place in some components.

With lawnmowers, 10W30 or multi-grade oil will probably be more suitable choices.

How Can I Tell What Stroke My Engine Is?

You can figure out whether your engine is 4-stroke or 2-stroke by our 2 recommendations.

You can tell by the engine oil tank. Two-stroke engines use a mixture of oil and gasoline in a single fuel tank. By contrast, the four-cycle engine does not require mixing oil and gasoline, so it has separate fuel and oil tanks. 

Look for the engine oil filler cap. If you see an engine oil reservoir behind another yellow cap, you can identify it as a four-stroke engine.

The valve timing arrangement can also be a hint for a 4-stroke engine. Inspecting the timing valve, you can see a package of chains, a camshaft, rocker arms, and a sprocket. It is usually located next to the cylinder above the crankshaft, so the chain length can be lessened.

However, 2-stroke engines have recently become unpopular. Most motorcycles have 4-stroke engines. You can ask the automotive consultant for a more accurate buying decision.


Have you picked your engine’s assistant? In sum, we call out the Maxima Premium4 as the winner of our best 4 stroke oil review. Maxima Premium confidently accompanies your every journey with standard specifications and reliable endurance.

The rest are also worth trying. You can refer to them if you feel they make sense better on your engine.

Over time, lubricants will have changes due to heat (oxidation, pyrolysis) and contamination (dust, water, etc.). The additives contained in the oil are consumed. 

Therefore, regardless of outstandingly initial functions, lubricants will no longer guarantee their lubricating performance and engine protection after a certain period of use. We need to flush and replace it with new oil periodically.

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