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Author Message   Motomadman Posted on Friday, July 21, 2006 - 08:17 pm:        I inadvertently changed the transmission oil in my S1 using Harley 20w-50 oil. I Didn’t realize I had messed up ‘till after a few rides. In looking through the archives looks like I should be running Mobil 1 15w50 motor and Mobil 1 75w90 gear oil in primary. Did I do any damage by running the wrong oil?   Oldog Posted on Friday, July 21, 2006 - 11:52 pm:        not likely just change it and change it sooner next time.   Paw Posted on Saturday, July 22, 2006 - 05:41 am:        Why not play it safe and use the recommended Harley primary oil. No brainer. Thats all i have ever used in my tranny's and never had a problem.   Djkaplan Posted on Saturday, July 22, 2006 - 09:05 am:        You didn't mess up - that oil is perfectly fine for your transmission.   Motomadman Posted on Saturday, July 22, 2006 - 10:51 am:        The shop manual calls for SPORT-TRANS FLUID, whatever that is. It doesn't give any alternatives or weight ranges to use.   Djkaplan Posted on Saturday, July 22, 2006 - 10:57 am:        I think you are under the impression that gear lube and motor oil are rated on the same scale for viscosity - they are not. 20w50 engine oil is approved for use in Sportster/Buell transmissions.   Bookyoh Posted on Saturday, July 22, 2006 - 10:25 pm:        Moto: I believe Harley now offers 3 options for use in the Sportster/Buell Primary and transmission: Sport trans Formula+ Syn3 I had been using Sport trans until they came out with Formula+. I switched last year to Formula+ because it works with my Superglide primary and transmission too. I can't say that I noticed any shift effort or feel difference between Sport trans and Formula+. Mark   Motomadman Posted on Sunday, July 23, 2006 - 01:17 pm:        Thanks for the Posts!! I just got Formula+ at the dealer. The parts guy said to flush out the old (20w/50 motor) oil as well, didn't suggest any products to use. Looking at Pyroil Engine Flush - 'melts sludge and cleans engine' etc. Contains kerosene and other cleaning agents. Since it's designed for a engine, I'm a bit leary of running it in my transmission. What do you guys think about flushing the transmission? Any specific product suggestions? Thanks again!!   Cyclonemick Posted on Sunday, July 23, 2006 - 01:29 pm:        You don't need to flush your system. The HD OIL is fine to put in your primary   Motomadman Posted on Sunday, July 23, 2006 - 07:23 pm:        Sounds GOOD! Thanks for the info!!   Oldog Posted on Sunday, July 23, 2006 - 11:29 pm:        don't flush you dont want the solvents on the stator, or the clutch plates.   Hodakaguy Posted on Monday, July 24, 2006 - 03:17 am:        I've always used Mobile synthetic 75-90W in my trans with great results. Gear oil and motor oil are rated different when it comes to viscosity. A 90W gear oil is about the same as a 30w motor oil on the viscosity index. If you go to the Amsoil site they recommend their 20-50w motor oil for the evo primary case in a sporty engine. Either will work fine. Don't worry about flushing, just drain and refill. Hodakaguy

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