AMSOIL 20W-50/NGK Iridium IX Harley-Davidson Dyno Test
AMSOIL recently set about to find what impact their synthetic motorcycle oil and NGK Iridium spark plugs would have on the horsepower and torque delivery in late model V-Twin Harley-Davidson motorcycles. AMSOIL recently set about to find what impact their synthetic motorcycle oil and NGK Iridium spark plugs would have on the horsepower and torque…
