15W-50 Synthetic Motor Oil for Racing, Motorcycles & High-Performance Engines
Maximum protection for extreme heat, high-RPM racing, motorcycles, & heavy-duty engines in Northwest Ohio.
Shop AMSOIL 15W-50 Synthetic Motor Oil // For Demanding Engines
Built for maximum wear protection in racing, turbocharged, air-cooled, & heavy-duty engines operating at peak stress.
For those who race or run high-performance or heavy-duty engines, 15W-50 is one of the best-performing engine oils when you need to push your engine to the edge of its operating temperature range. At Amsoil, we are proud to offer a variety of 15W-50 blends formulated to protect your engine and maximize its performance. From Dominator Racing Motor Oil to Metric Motorcycle Oil and even Small Engine Oil, Amsoil is your home to ultra-protective 15W-50 blends that you can trust.
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What makes AMSOIL's 15W-50 Motor Oil Different?
15W-50 motor oil is one of the thickest motor oil viscosities on the market and is designed for high-performance, racing, and heavy-duty engine use under high stress and in extreme heat. This engine viscosity is all about protection, keeping engine components safe when pushing an engine to the max. With a high shear rating and superior wear additives, 15W-50 can maintain a strong lubricating film where thinner oils would break down.
What kind of engines use 15W-50 engine oil?
There are a variety of engines that use 15W-50 motor oil. For small engines, brands like Scag, Exmark, Gravely and Ariens all call for 15W-50 synthetic oil for their zero-turn mowers. Kawasaki, Kohler, and Briggs and Stratton also recommend this viscosity for their heavy-duty air-cooled engines.
On the motorcycle side, a variety of sports, touring, and cruisers are recommended for this thick oil, including the Kawasaki Ninja, Honda CBR, Royal Enfield, Ducati Multistrada, BMW R1200 GS Adventure, and larger Yamaha Adventure models.
For diesel engines, 15W-50 is often used in Cummins 5.9L, Ford 7.3L and 6.0L Power Stroke engines, and a variety of older-model commercial engines, such as the CES 20078 Caterpillar Cummins engine.
What is the ideal use-case for 15W-50 synthetic motor oil?
15W-50 synthetic motor oil is commonly used in performance motor sports with turbocharged engines, racing applications, or in air-cooled engines such as metric motorcycles. In addition to on-track and touring performance, 15W-50 is also used in a variety of small engines, including those in zero-turn mowers and other lawn equipment.
What's Your Choice Of Ride?
We have an AMSOIL product for every vehicle - it's your ride, you decide.
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AMSOIL // Engineered For What You Drive & How You Drive
From daily drivers to diesel haulers, weekend toys to workhorse machines — every engine deserves oil that’s made to handle the way you use it. Share a few details with us, and we’ll match you with the premium AMSOIL products designed to protect your engine and boost performance where it counts.
Frequently Asked Questions
No Dumb Questions, Just Dry Dipsticks
Can I run 15W-50 in my zero-turn mower?
Yes, Amsoil has a specific small engine oil blend that is perfect for zero-turn mowers. This formula offers commercial-grade protection against wear, heat, and carbon deposits and is designed for maximum equipment dependability. With a service life of up to 200 hours, you will be able to cut the lawn for the entire summer before you need an oil change.
What is the difference between Dominator and Freedom Series Racing Motor Oils?
Both the Dominator and Freedom Series Racing Motor oils are premium, high-performance motor oils designed to handle extreme racing conditions. Dominator is a general racing oil formulated for high-RPM, high-temperature racing engines, with a high-shear-stable formula and high zinc content to help protect engine components. Comparatively, the Freedom Series racing oil is specifically designed for high-horsepower and turbocharged diesel engines, and is formulated to work in Cummins, Duramax and Ford diesel racing engines.
Is the Metric Motorcycle Oil wet-clutch compatible?
Yes, Amsoil Synthetic Metric Motorcycle Oil is fully wet-clutch compatible. It meets JASO MA and JASO MA2 requirements, ensuring smooth clutch engagement and superior protection for metric motorcycles.
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High Performance, Higher Praise // AMSOIL Reviews Straight from the Source
From coast to coast, AMSOIL Dealers are earning high marks from customers who know their engines. Whether it’s a daily driver in New York, a dirt bike in Arizona, or a diesel truck in Texas, real reviews are rolling in from every corner of the country — all praising the performance, protection, and reliability that AMSOIL delivers.