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Author Message   Scoobytwo Posted on Tuesday, July 25, 2006 - 05:18 am:        I tried doing research in the Knowledge Vault but I found it to be conflicting and confusing on what oil is best for the primary. Anyways this is specific to the XB's ( 2004 XB12S), so what would you say is the best oil to use in the primary and why. Thanks everyone.   Davo Posted on Tuesday, July 25, 2006 - 05:59 am:        I use AMS oil MCV 20w-50 in both holes because I am sold on the specifications. Also: 1. 100% synthetic 2. no friction modifiers 3. wet clutch compatible The stock HD primary oil (formula+ 99851-05) and HD Syn3 are both good as well.   Dragonbuell12r Posted on Tuesday, July 25, 2006 - 06:51 am:        Run your favorite synthetic motor oil. I don't know what Buell puts in at the factory, but my bike shifted so much better once I put Mobil 1 15w50 in there. Have fun and try what you like, it's only a one quart expense.   Cheesebeast Posted on Tuesday, July 25, 2006 - 09:10 am:        Ditto what Davo said. I am running Amsoil 20w-50 for both applications. The difference that the Amsoil made in the primary was striking. Way smoother!   Beachbuell Posted on Tuesday, July 25, 2006 - 10:32 am:        Screamin Eagle Synthetic 3 all around. Bike seems to run a lot cooler and you can go a bit longer between fluid changes if you'd like. 9$ a bottle, stuff is like liquid gold.   Brucelee Posted on Tuesday, July 25, 2006 - 10:51 am:        Screamin Eagle Synthetic 3 The problem with this oil is that we know virtually nothing about it save what HD deigns to tell us. I use Red Line in both holes.   Jcbikes Posted on Tuesday, July 25, 2006 - 11:03 am:        80w90 Gear oil works great. 11,000 on my bike and trans. works great. I change oil every 1,500 miles and it is clean.   Lorazepam Posted on Tuesday, July 25, 2006 - 12:26 pm:        Glad I have a warranty cause I have syn 3 in the primary right now. I dont think HD is going to put something in there that isnt up to the task.   Buellman39 Posted on Tuesday, July 25, 2006 - 12:29 pm:        Amsoil 20-50 in both holes   No_rice Posted on Tuesday, July 25, 2006 - 12:32 pm:        i run syn3 in the motor and had it in the primary. just changed that to formula plus this morning. not sure i really liked the syn3 in it. guess i will see if anything changes. the thing i noticed was that i never really had a problem with missed shifts or things like that until i started running the syn3. i had plenty of miles on it with the regular primary lube so i cant believe i just forgot how to shift suddenly about the same time i changed lubes. i'm going to see what happens with the formula plus in there. not like it can hurt.   Bake Posted on Tuesday, July 25, 2006 - 04:06 pm:        Anyone using Royal Purple 85/95? I saw it yesterday but it has limited slip additives and it made me wonder if this was good for the clutch?   Whodom Posted on Tuesday, July 25, 2006 - 06:15 pm:        I had seen this posted previously at BadWeb, but I wanted to confirm it for myself. I went to Mobil1.com, e-mailed Mobil, and asked them what lubricant they recommend for Buell primaries. Their response: "Mobil1 MX4T 10W40 motorcycle motor oil [synthetic] is the recommended and appropriate product." I think I'm gonna try that at my next change.

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