My third test was using Amsoil Synthetic 20W-50 oil in the crankcase, Amsoil synthetic 10W-40 oil in the primary chaincase, and Amsoil Severe Gear 75W-90 Synthetic Gear Lube in the transmission. On the down side, the occurance of false neutrals (or false 1st gear) increased substancially! Coincidence? This led me to want to try another product line just to see if it was related to the Syn3 oil or an unrelated occurance. Also the all too familiar shifting “clunk” seemed like it had quieted down slightly. Temperature readings fluctuated about the same as the conventional oil. Once again I followed the same daily temperature testing and found the oil temperature dropped off an average of 2 degrees below that of the regular petrolium-based oil. Outdoor temps during this test period varied but were typically in the mid to upper 90′s. What I found was my oil temperature averaged approximately 240 degrees (Fahrenheit) at the conculsion of each commute and appeared to fluctuate approximately 7-10 degrees.įollowing this test (4+ weeks later) I changed oil to H-D’s Screamin’ Eagle® Syn3 20W-50 in the crankcase, primary, and transmission as recommended. I live in Southern California so the clutch and tranny get a good workout with plenty of time to heat up. All tests were performed during the summer months on a daily commute of 40 miles under a combination of traffic conditions. The bike was driven an additional 1500 miles and monitored daily for oil temperature after the first week. Following the initial break-in period, the recommended 1000 mile service was performed and lubricants were replaced with Harley brand petrolium based lubricants.
WHAT WEIGHT OIL FOR HARLEY TRANSMISSION FREE
Also worth reading is the Great Oil Debate article written for American Iron magazine regarding synthetic oils.įor my comparison I used a stock 2004 Heritage Twin Cam 88b with free breathing SE exhaust and K&N air cleaner. To read about wear test comparisons performed between Screamin’ Eagle® Synthetic (SYN3) and AMSOIL Synthetic Oil check out Amsoil vs. I’m not a chemist nor do I own a sophisticated test facility so my comparisons are based on personal observations and simple temperature readings. Performance is what counts so I set out to try several brands for myself to see if there really was a difference. Rather than writing about the merits of synthetic oil being a superior product over petrolium based products, I thought I’d simply share my own experiences and let you decide. I’m not about to fuel the fire about the motor companies about-face on the use of synthetics, conflicting research reports, or all the mechanics who swear that “only Harley oil is formulated for Harley engines”. Synthetic oil for Harley-Davidson motorcycle’s is probably one of the most debated subjects you will find on any message board or in any Harley magazine.
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