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 oil should i use in my 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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