High-Performance Motorcycle Engine, Transmission and Primary Chain Case Oil
Comparison Tests Prove AMSOIL is the Best Motorcycle Oil: Compare to Honda, Mobil, BMW, Castrol, Suzuki, Valvoline, Lucas, Motul, Royal Purple, Harley Davidson, Spectro, Pennzoil, Bel Ray, Maxima, and Torco SAE 50 Oils
The advanced multi-functional formula of AMSOIL Full Synthetic 20w50 V-Twin Motorcycle Oil (Product Code: MCV) provides second-to-none protection for hot-running domestic and foreign motorcycles engines, transmissions and primary chain cases, outperforming other conventional and synthetic motorcycle oils. Comparison tests prove AMSOIL Synthetic 20w50 is the best motorcycle oil. Compare it to Harley Davidson and other major oil brands in the Product Details below.
AMSOIL Synthetic 20w50 V-Twin Motorcycle Oil is designed for those who demand the absolute best oil for their motorcycles. It is the result of extensive research and it is specially formulated to excel in all areas unique to motorcycles, including high temperatures of air-cooled engines such as Harley-Davidson V-Twin, wet-clutch lubrication, extreme-pressure regions of gears and chains and rust common to short trips and storage.
AMSOIL Synthetic 20w50 V-Twin Motorcycle Oil fulfills the requirements of both domestic and foreign motorcycles. It is excellent in air-cooled motorcycle engines due to high heat resistance. Unlike many motorcycle oils, AMSOIL 20w50 Motorcycle Oil contains special anti-rust agents that not only protect against corrosion and acids during operation, but also provide exceptional protection during storage. It can be used in engines, transmissions and the primary chaincase for up to twice the motorcycle manufacturer-recommended oil change interval. Meets JASO MA-MA2 (Motorcycle Wet Clutch) performance specifications. Not recommended where an API GL-4 or GL-5 gear oil is required.
- Excellent for roller bearings and does not cause “skate” or “float” in V-Twin engines
- Prevents foaming in high-RPM engines
- Eliminates the need for multiple lubricants – motorcycle engine, transmission & primary chaincase oil
- Provides positive clutch engagement and smooth shifting
- Prevents clutch slippage and glazing
- Withstands extreme heat
- Retains viscosity
- Better performance and price than competitive motorcycle oils
- Provides exceptional protection against rust and corrosion during storage
- Robust anti-wear additive packages provide superior wear protection and longer equipment life
- Recommended for twice the manufacturer’s recommended oil change interval for on-road motorcycles
AMSOIL Full Synthetic 20w50 V-Twin Motorcycle Oil Product Code Pkg/Size MCVQT-EA Quart Bottle MCVQT-CA Quart Bottles (case of 12) MCV1G-EA Gallon Bottle MCV1G-CA Gallon Bottles (case of 4) MCV30-EA 30-Gallon Drum MCV55-EA 55-Gallon Drum MCV27-EA 275-Gallon Drum
Dyno Testing Proves AMSOIL Withstands Extreme Heat
To prove its extreme-heat protection qualities, AMSOIL Full Synthetic 20w50 V-Twin Motorcycle Oil was subjected to a dynamometer test designed to simulate conditions even more extreme than the demanding stop-and-go driving conditions of a motorcycle rally or parade route. A 2012 Harley-Davidson FXDB Dyna Street Bob motorcycle equipped with AMSOIL 20w50 Motorcycle Oil was subjected to a strenuous low-speed test cycle, with significant idle time broken by short bursts of engine revving and little to no air moving across the cylinders. To create the most-severe operating conditions possible, the electronic temperature controls, which safeguard the motorcycle when temperatures reach dangerous levels, were deactivated. Despite little air flow and cylinder temperatures reaching more than 500°F (and oil temperatures exceeding 300°F), oil analysis revealed no change in oil viscosity and only minor levels of oxidation, TBN depletion and wear (see graphs below) – proving, without a doubt, that AMSOIL delivers outstanding protection, even in the most extreme conditions.
Oil Analysis Results for AMSOIL 20w50 Motorcycle Oil After 70 Minutes of Torturous Dyno Testing and Heat Exposure
Reduces Engine Wear
AMSOIL Synthetic 20w50 V-Twin Motorcycle Oil contains a heavy treatment of anti-wear additives to reduce wear regardless of the operating conditions. The ASTM D-4172 4-Ball Wear Test is a good measure of an oil’s ability to minimize wear in case of metal-to-metal contact. The smaller the average wear scar, the better the wear protection provided by the lubricant.
AMSOIL 20w50 Motorcycle Oil Provides Superior Wear Protection
Maintains Oil Viscosity
Unlike many competing oils, AMSOIL Synthetic 20w50 V-Twin Motorcycle Oil remained incredibly stable throughout the duration of the Viscosity Shear Stability Test (ASTM D-6278), a test that determines and oil’s ability to retain its viscosity under shearing forces. The importance of shear stability cannot be overstated. It is important to note that in order to meet JASO and ISO motorcycle oil standards, an SAE 50 oil must not shear below 15 cSt in 30 cycles. AMSOIL 20w50 Motorcycle Oil meets the highest JASO and ISO rating, JASO MA2 and ISO L-EMA2.
The high temperatures and tight tolerances common to motorcycle applications also affect an oil’s viscosity – shear stability along with good high-temperature viscosity are critical in motorcycle applications. These two areas in combination are measured by the High Temperature/High Shear Viscosity Test (HT/HS ASTM D-5481). This test is important because bearings require the greatest level of protection during high-temperature operation. Test results are indicated in centipoises (cP), which are units of viscosity. The higher the test result, the greater the level of viscosity protection offered by the oil – even a difference of 0.1 cP makes a significant difference.
AMSOIL 20w50 Motorcycle Oil Prevents Bearing Wear
Do High Levels of Zinc Offer Better Wear Protection?
Zinc dithiophosphate (ZDP) is commonly added to internal combustion engine oils as a last line of defense in wear control is. If contact occurs, the additive coating takes the abuse to minimize component wear. However, the quantity of zinc content alone does not indicate an oil’s performance; additional testing must be reviewed to determine an oil’s actual ability to prevent wear. Therefore, it cannot be assumed that oils with higher concentrations of zinc provide better wear protection. Although AMSOIL 20w50 V-Twin Motorcycle Oil contains high levels of zinc (more than most of the other oils tested), the oils that had higher levels of zinc did not perform as well as AMSOIL on the ASTM D-4172 4-Ball Wear Test.
Eliminates the Need for Separate Motorcycle Engine Oil and Transmission Oil
With AMSOIL Synthetic 20w50 V-Twin Motorcycle Oil, there is no need for separate transmission or primary chaincase oils. It provides motorcycle engines and transmissions operating in the harshest conditions with superior protection against wear and viscosity loss. It is absolutely shear stable and will not thin out from mechanical activity (as shown in the ASTM D-5481 test above). AMSOIL 20w50 V-Twin Motorcycle Oil performs like a gear oil without the negative effects of extreme pressure additives. It meets SAE 90, API GL-1 gear oil requirements and is the primary recommendation for V-twin transmissions and primary chaincases. In the FZG gear test, AMSOIL achieved a perfect score of zero wear rating (see photo below).
AMSOIL 20w50 Motorcycle Oil Achieved a Perfect Score on the FZG Gear Test
Note: Because the FZG Gear Test and the 4-Ball Wear Test measure wear protection differently and address different lubrication concerns within a motorcycle, it is important for an oil to score well in both of these tests to ensure superior protection in a variety of motorcycle applications and conditions. AMSOIL 20w50 Motorcycle Oil also earned incredible scores on the 4-Ball Wear Test, as previously mentioned.
Excellent Wet Clutch Performance
Motorcycle oils must be multi-functional, meeting the needs of both the engine and transmission. An additional concern is that many motorcycles utilize a clutch that is immersed in the motor oil. As the clutch is a frictional device and oils are by design used to minimize friction, concern arises over the impact the oil may have on the operation of the motorcycle clutch. How an oil performs in a wet-clutch application is, in part, a function of its additive system. An oil should be free of additives, such as friction modifiers, that can dramatically alter the dynamic and static frictional properties of the clutch and result in clutch plate slippage.
The friction modifiers present in many automotive motor oils and the extreme pressure additives present in EP gear lubricants produce a low coefficient of friction between the clutch discs and plates, resulting in clutch slippage and glazing. Slippage leads to increased operating temperatures and reduced clutch life. Friction modifiers in motorcycles have also been attributed to engine start failures, a rough running feel, increased fuel consumption due to higher engine stall speeds and other problems.
AMSOIL Synthetic 20w50 V-Twin Motorcycle Oil is formulated without friction modifiers, providing positive clutch engagement and smooth shifting. It controls heat and prevents slippage and glazing and resist acids that can degrade clutch material, helping improve motorcycle clutch life. And, its high TBN (11.1) helps improve clutch life by resisting the acids that can degrade clutch material.
JASO Oil Standards
Wet clutch compatibility is determined using JASO and ISO test methods. There are four specifications: JASO MB, MA, MAQ, MA2 (and ISO L-EMB, L-EMA, L-EMA1 and L-EMA2). Oils falling into the MB (L-EMB) category offer minimal wet clutch performance, while MA2 (L-EMA2) oils offer the best performance to help prevent clutch plate slippage. Testing revealed that AMSOIL Synthetic 20w50 V-Twin Motorcycle Oil meets the highest JASO rating, JASO MA2 (L-EMA2), offering superior wet clutch performance.
Extends Oil Life and Reduces Engine Sludge
Motorcycles operate in demanding, high-heat conditions. Air-cooled engines get especially hot while idling in traffic. Heat can destroy lubricants; high temperatures accelerate oxidation, which shortens the oil life and promotes carbon deposits. Oxidized lubricants can create and react with contaminants such as fuel and water to produce corrosive by-products. Oxidation stability is critical in air-cooled and high-performance motorcycles.
AMSOIL Synthetic 20w40 V-Twin Motorcycle Oil is thermally (heat) stable and contains maximum levels of oxidation inhibitor additives. It is extremely resistant to breakdown and engineered to prevent damaging sludge and carbon deposits for superior engine cleanliness. The ASTM D-4742 Thin-Film Oxygen Uptake Test (TFOUT) determines an oil’s ability to resist oxidation. As shown in the chart below, only 29% of the SAE 50 group oils achieved the maximum obtainable results of 500 minutes. The poor results of the remaining oils suggest a faster rate of degradation and shorter service life.
AMSOIL 20w50 Motorcycle Oil Prevents Engine Sludge
Reduces Motorcycle Emissions and Oil Consumption
When oil is heated, lighter fractions in the oil volatilize (evaporate). This leads to increased oil consumption, emissions and viscosity increase. Higher operating temperatures produce greater volatility. To determine an oil’s resistance to volatility, ASTM D-5800 NOACK Volatility Test is used. The results illustrated in the chart below show a significant difference between those oils with low volatility and those with higher volatility. Low volatility is of particular benefit in hot running, air-cooled engines.
AMSOIL 20w50 Motorcycle Oil Reduces Emissions and Oil Consumption
Engine Cleanliness and Longer Oil Life
Motor oils are designed to neutralize acids and keep engines clean. Both tasks can be accomplished, in part, through the use of detergent additives, as they are alkaline in nature. Alkalinity is measured using ASTM D-2896 testing methods. Reported as a Total Base Number (TBN), this test determines the amount of acid required to neutralize the oil’s alkaline properties. The higher the result, the greater amount of acid the oil can withstand. Detergent additives are depleted as they neutralize acids. Therefore, oils with a higher TBN should provide benefits over a longer period of time. AMSOIL Synthetic 20w50 V-Twin Motorcycle Oil has a high TBN value of 11.1 for superior engine cleanliness and longer oil life.
Oil Foam is Reduced for Long-Term Engine Protection
During engine and transmission operation, air is introduced into the lubricating oil, which may produce foam. In severe cases, foam can increase wear, operating temperatures and oxidation. Oil is non-compressible, but when air passes through loaded areas, the bubbles can collapse and allow the metal surfaces to contact each other. In addition, the oil has a larger surface area exposed to oxygen when air is trapped in the oil, which promotes increased oxidation. Higher operating speeds and churning gear systems in motorcycles increase the need for good foam control. While oil cannot prevent the introduction of air, it can control foaming through the use of anti-foam additives. AMSOIL Synthetic 20w50 V-Twin Motorcycle Oil greatly reduces foaming to provide long-term lubricating protection in high-speed, high-RPM conditions. In the ASTM D-892 Foam Test, AMSOIL 20w50 Motorcycle Oil exhibited zero foam.
Excellent Corrosion and Rust Protection
Motorcycles are prone to rust from storage, humidity and short drives. Rust can cause major damage such as roller bearing failure, uncontrolled wear, compression loss and blow-by. Good rust protection, however, comes by design and is not natural to engine oils. Unlike many motorcycle oils, AMSOIL Synthetic 20w50 V-Twin Motorcycle Oil contains special anti-rust agents that not only protect against corrosion and acids during operation, but also provide exceptional protection during storage. As shown in the photos below, AMSOIL 20w50 Motorcycle Oil passes the ASTM D1748 humidity cabinet rust test, demonstrating superior rust protection.
AMSOIL 20w50 Motorcyle Oil Prevents Engine Rust and Corrosion
Offers Excellent Insurance at a Competitive Price
Although the initial price of a product is a primary concern, it does not reflect the actual cost of using the product. Less expensive oils may save money initially but can cost more in the end if they compromise performance. The additional benefits offered by a more expensive oil can offset the difference in price. For example, oils that last longer cost less over time, and oils that offer superior anti-wear performance and rust protection can increase equipment life, reducing expensive repairs. High-quality motorcycle oil is an inexpensive way to protect an expensive investment.
AMSOIL Synthetic 20w50 V-Twin Motorcycle Oil is cost competitive with competing high-end motorcycle oils. And the unmatched protection and performance provided by AMSOIL 20w50 Motorcycle Oil is excellent insurance for today’s expensive motorcycles and custom bikes.
Extended Service Life
AMSOIL Synthetic 20w50 V-Twin Motorcycle Oil is a proven long-drain oil and can extend drain intervals far beyond those recommended for conventional oils. Their unique synthetic formulation provides a service life up to two times longer than manufacturers’ recommendations and offers the best protection against wear, making AMSOIL 20w50 Motorcycle Oil even more cost effective at keeping the costs of operating and maintaining motorcycles down.
On-road use in engines, transmissions and primary chaincases: Up to two times the motorcycle manufacturer’s recommendation or one year, whichever comes first. For Big Twin Harley-Davidson transmissions only, follow the Harley-Davidson recommended drain interval for synthetic oil of up to 20,000 miles or one year, whichever comes first.
Off-road use in engines, transmissions and primary chaincases: Follow the recommended drain interval of the motorcycle manufacturer.
Racing or in engines modified from the original factory design: No change interval recommendation is made. Oil changes are at the owner’s discretion.
Oil Filter Service Intervals
Extended oil drain intervals are based on the user following AMSOIL recommended oil filter service intervals:
- If using an AMSOIL Ea Motorcycle Oil Filter, install a new oil filter at time of oil change. AMSOIL Ea Motorcycle Oil Filters are designed for extended oil drain intervals. They stop smaller particles, allow more oil flow and last longer than regular filters.
- If using other brands oil filters, install a new oil filter at time of oil change then change at the engine manufacturer’s recommended filter change intervals.
AMSOIL Synthetic 20w50 V-Twin Motorcycle Oil is recommended for liquid or air-cooled 4-stroke engines. It meets SAE 90, API GL-1 gear oil requirements and is recommended for transmissions and primary chaincases. AMSOIL 20w50 Motorcycle Oil is recommended for Aprilia, BMW, Buell, Ducati, Harley Davidson, KTM, Triumph and other motorcycles where 15w50 or or 20w50 engine oils or SAE 90, GL-1 gear oils are used. It is not recommended where an API GL-4 or GL-5 gear oil is required.
Harley Davidson Oil Recommendation ChartAttention Power Sports Enthusiasts!
AMSOIL Online Application Guides contain lube and filter specifications for motorcycles, ATVs, UTVs, snowmobiles, PWC (personal watercraft) and marine outboards.
AMSOIL Full Synthetic 20w50 V-Twin Motorcycle Oil (MCV) meets or exceeds the following performance test requirements and may be used in motors requiring oils meeting these specifications:
- API SG, SL/CF, CG-4
- API GL-1
- JASO MA-MA2 (Motorcycle Wet Clutch)
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