While you may certainly use the AMSOIL 20W-50 motorcycle oil as a replacement for the Harley Davidson Syn3 in all three areas, AMSOIL’s alternative recommendation is for using their 20W-50 Synthetic Motorcycle Oil for the engine crankcase, Severe Gear 75W-90 Synthetic Gear Lube for the transmission and the 10W-40 Synthetic Motorcycle Oil for the primary chaincase.įor Sportster 883cc and 1200cc motorcycles, the AMSOIL Synthetic 20W-50 Motorcycle Oil is recommended for both the engine and transmission. Harley Davidson recommends using their new 20W-50 Syn3 in the engine, transmission and primary chaincase. This data indicates that the Harley Davidson SYN3 oil leaves a wear scar 79% higher than the AMSOIL motorcycle oil. In the more severe 4-Ball Parameter 3 test (shown above) the Harley DavidsonScreamin Eagle Syn3 left a wear scar of 0.70 mm while the AMSOIL 20W-50 Synthetic Motorcycle Oil left a wear scar of only 0.39 mm. In the original 4-Ball Parameter 1 test the Harley Davidson "Genuine" motorcycle oil left a wear scar of 0.40 mm while the AMSOIL 20W-50 Synthetic Motorcycle Oil left a wear scar of only 0.35 mm. The latest test results comparing the new Harley Davidson Screamin’ Eagle Syn3 to AMSOIL 20W-50 Motorcycle Oil are in. The most notable differences between the two products are in the 4-ball Parameter 3 wear test. In Industry Standard Four-Ball Wear Testing, Harley Davidson’s Own "Genuine" Motor Oil Produces the Highest Wear Scar vs.
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