V-Twins Get Hot
Harley-Davidsons* and other bikes with big V-twin engines generate significant heat, especially in low-speed parades, in rally traffic or on long climbs on hot days.
Motor oil plays a critical role in cooling these big air-cooled engines, and even more so
in low-speed operation with limited wind generated to cool the bike. If the oil can’t withstand the heat, its ability to protect your bike is compromised.
AMSOIL Synthetic Motorcycle Oil
Protects in Extreme Heat
To demonstrate its extreme-heat protection qualities, AMSOIL 20W-50 Synthetic 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
20W-50 Synthetic Motorcycle Oil was subjected to a strenuous low-speed test
cycle, with significant idle time broken by short
As temperatures climbed to more than 500°F in the cylinders, an infrared camera revealed the red-hot con- ditions that assaulted the engine components and oil.
world. Cylinder temperatures reached more
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bursts of engine revving and little to no air moving across the cylinders. Like most Harley-Davidson motorcycles, the Dyna Street Bob features an
air-cooled V-twin engine, which relies on cooling fins arrayed along the cylinder walls to conduct heat away. To create the most-severe operating conditions possible, the electronic temperature controls, which safeguard the motorcycle when temperatures reach dangerous levels, were deactivated. The combination of low airflow and inoperative temperature controls allowed the test lab to subject the oil and engine components to intense heat not normally experienced in the real
than 500°F, and oil temperatures exceeded
300°F – temperatures well into the range where oils begin to break down and often lead to catastrophic failure.
500°F is No Problem
The extreme temperatures were no match for AMSOIL Synthetic Motorcycle Oil. After nearly 70 minutes of torturous testing and heat exposure, oil analysis revealed no change in oil viscosity and only minor levels of oxidation, TBN depletion and wear (see graphs on reverse).