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[fxdsebeloved]

I have been lead to believe from Mo Co that you should run the Syn3 in the Chain case,Transmission and crankcase. The more I read on Oils for your SE110 most are saying to use 3 differant viscosities as noted below.  Would I be better off running the 3 viscosities???


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. I should note here that the synthetic oils were those specified for use in V-Twin motorcycles and lacked the friction modifiers as recommended for Harley engines. I also used only genuine H-D oil filters for each test. While you can use the same 20W-50 for all 3 crankcase, primary, and transmission as with H-D Syn3 (the name Syn3 refers to use in all 3), I chose to use viscosity ranges that more closely matched those of the recommended petroleum based oils. This is probably just my own opinion but I believe 20W-50 is too heavy for the primary which requires more cooling than it does lubrication. Same goes for the transmission, where the originally equipped gear oil is closer to 75W-90 and 20W-50 seems like it would be too thin. Harley doesn't openly publish the viscosity of their petroleum based gear oil (they just give a part number) but most agree it is in the range of 75W-90. Using 3 different lubricant viscosities also happens to be a recommendation of the manufacturer, who calls this a "Three-fluid system".
This test using the Amsoil three-fluid system showed an average temperature reduction of 12 degrees from stock and 9 degrees less than Harley-Davidson's Syn3. Temperature fluctuation seems to have flattened out as well with the oil temp staying between 225 and 230. Outdoor temps during the day have been a consistent 90+ degrees with quite a few days breaking the 100 mark during the testing
   

[Indenial]

Good choice. Run Amsoil 20-50 in both engine and primary and 75-90 Severe gear lube in tranny. I do and my temps are around 220 in 85 degree runs. Using 20-50 in both holes only makes for less oil bottles on the shelf.

[grc]

I am a firm believer in running different lubes in the 3 holes.  The one lube in all 3 is not based on what is best for each system, it's a sales gimick to try and sell more of their high priced SYN3.

BTW, don't compare viscosity numbers directly between motor oil and gear oil.  They use different scales and definitely are not the same.  For instance, a 90 wt gear oil is roughly equivalent in viscosity to a 50 wt motor oil. 

Jerry