Best 10W40 Motorcycle Oil

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Today, we’ll be outlining the best 10w40 motorcycle oil currently available.

We tested over 20 different engine oils before making our top 3 list.

While we may not be chemical engineers, we have decades worth of experience working on motorcycles and feel we can make a good selection for motorcycle oils.

Furthermore, we believe in getting our hands dirty with real world tests to gauge the quality of any manufacturer, so we put the following oils through several relevant tests to check their efficacy.

Our #1 choice was Motul’s 7100 motorcyle engine oil, earning the top spot for its unique formulation, high performance, and great value. Read on to see why we love this and other 10w40 oils.

ImageProductFeaturesPrice
Motul 7100 10w40 Synthetic Engine OilMotul 7100 10w40 Synthetic Engine Oil
  • Fully synthetic engine oil
  • Suitable for high temperature use
  • Ester material is used
  • Volatility is low
  • Prevents excessive shearing of components
  • Protects gearbox
  • Makes shifting smoother
  • Improved throttle response
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Mobil 1 Racing Engine OilMobil 1 Racing Engine Oil
  • Protects engine from wear and tear
  • Also lubricates clutch and transmission well
  • Better throttle response
  • Smoother ride quality
  • Budget friendly
  • Great for bikes that are used a lot
  • Eliminates a lot of engine and transmission noise
  • Makes shifting smoother
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Castrol Power 1 Synthetic 10w40 Engine OilCastrol Power 1 Synthetic 10w40 Engine Oil
  • Improved throttle response
  • Better fuel mileage 
  • Longer intervals between oil changes
  • Improved abrasion resistance
  • Cooler temperatures at idle and at speed
  • Shifting gear is smoother
  • Slightly faster acceleration
  • Cleaner running engine
  • Eliminates clutch disc sticking
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Motul 7100 10w40 Synthetic Motorcycle Engine Oil

Overall best

The 7100 from Motul was designed specifically for street focused, four stroke motorcycles with catalytic converters. A fully synthetic oil garnered many points in testing, delivering more efficient consumption, reducing harmful abrasion of components, and making the bike ride smoother.

More than just improving engine performance, the 7100 also lengthens your engine’s lifespan. Designed to withstand the highest engine temperatures, it is an excellent choice for bikes that get used a lot for daily commuting or touring, where your engine’s components are constantly under a lot of stress.

Ester technology is incorporated into this oil, helping boost power and efficiency. Our testing showed a noticeable increase in responsiveness and a dramatic decrease in the sound of the engine. Moreover, Motul’s proprietary high pressure formula helped protect the transmission from harm during high speed shifting. Shifting in and out of gear was significantly smoother and had a lot less ‘clunky’ feeling.

The 7100 also uses additives that help safeguard your engine from particular problems. Anti-wear additives prevent excessive shearing of components, protect the engine long term, and increase its lifespan. Motul’s oil was excellent at cleaning the engine and managing contaminant particles efficiently.

Finally, this oil is API SL/SH/SG and JASO MA standard compliant, meaning it was tested and approved for motorcycle use by folks a lot smarter than us. These certifications are necessary as they ensure the oil’s quality and effectiveness in protecting your engine.

Pros
  • Fully synthetic engine oil
  • Suitable for high temperature use
  • Ester material is used
  • Volatility is low
  • Prevents excessive shearing of components
  • Protects gearbox
  • Makes shifting smoother
  • Improved throttle response
Cons
  • Not the best choice for older model bikes

Mobil 1 Racing Engine Oil

Best Budget

Mobil 1 delivers a budget friendly engine oil that also works well. This oil brought out a lot of character in our engine while also cleaning it and protecting the internals from harm.

Put simply, the Racing Engine Oil from Mobil 1 performs on par with more expensive engine oils while undercutting their price, making it a worthy consideration for bikes that get used frequently and need a more economical engine oil solution. With our testing, the Mobil 1 made the engine respond better and smoothened out the ride, especially highway riding.

Although it is advertised for use with street bikes, we were surprised that the Mobil 1 works just as well in offroad scenarios, such as in our ADV. It reduces shearing and abrasion, preventing early engine degradation. We can attest to significantly smoother engine performance with this oil. Even starting up the bike, the smoother operation and better ignition was easily recognizable.

Besides the engine, this oil also protects your gearbox and clutch as well. Shifting up and down was not only smoother but less noisy, even on our beat-up test bike. Unnecessary engine noise is reduced, and the overall operation is smoother.

Pros
  • Protects engine from wear and tear
  • Also lubricates clutch and transmission well
  • Better throttle response
  • Smoother ride quality
  • Budget friendly
  • Great for bikes that are used a lot
  • Eliminates a lot of engine and transmission noise
  • Makes shifting smoother
Cons
  • Not the best choice for air cooled engines

Castrol Power 1 Synthetic 10w40 Engine Oil

Best Premium Option

Castrol’s Power 1 Synthetic engine oil benefits from Castrol’s long history in racing and motorsport. It is one of the highest performing oils we tested and makes a huge difference in day to day riding quality and a noticeable decrease in clutch disc sticking.

The Castrol is designed to flow fast and stay strong over a more extended period. It is a durable oil, which will allow for longer intervals between oil changes by our estimation. This oil offers superior engine lubrication and resistance to wear, with ride quality benefiting as a result. We were treated to smoother startups, cooler idle temperatures, and more comfortable daily commuting using the Castrol.

We were pleasantly surprised with the efficiency of this oil as it cleaned the engine of contaminants and got us slightly better mileage at the same time. Moreover, the bike was a hair quicker and more responsive to rider input. We could not check actual performance figures due to logistical constraints so our ‘butt dyno’ will have to suffice. The motorcycle was significantly quicker to accelerate, had better throttle response, and gear shifting was smoother on both track and street.

All said and done, the Castrol holds its own in a sea of competitive oil and is worth considering for your bike.

Pros
  • Improved throttle response
  • Better fuel mileage
  • Longer intervals between oil changes
  • Improved abrasion resistance
  • Cooler temperatures at idle and at speed
  • Shifting gear is smoother
  • Slightly faster acceleration
  • Cleaner running engine
  • Eliminates clutch disc sticking
Cons
  • Some imilarly priced options provide better lubrication

Author
Cooper Higgins

Cooper Higgins is a motorcycle enthusiast who’s been riding for the last 10 years. He’s passionate about all things motorcycles and started Bikes Future to help other riders make the right motorcycle moves. He rides a pimped out white Kawasaki Ninja 400, and also enjoys adventure riding when out of the City.