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Old Feb 17, 2007 | 05:02 PM
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Default Primary oil
What is the best synthetic oil to put in the primary?Currently, Mobil 1V 20 50 in engineMobil 1 gear oil in trans, HD dino oil in primary.
 
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Old Feb 17, 2007 | 05:10 PM
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Default RE: Primary oil
Personally, I would stay with HD Formula +.
 
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Old Feb 17, 2007 | 05:25 PM
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Default RE: Primary oil
what he said.
ORIGINAL: soos

Personally, I would stay with HD Formula +.
 
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Old Feb 17, 2007 | 05:26 PM
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Default RE: Primary oil
What they both said
 
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Old Feb 17, 2007 | 07:14 PM
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Default RE: Primary oil
I use Mobil 1 synthetic auto trans fluid in my '04 RK custom. No issues.
 
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Old Feb 17, 2007 | 07:24 PM
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Default RE: Primary oil
I'm using Amsoil 20W/50 in the Engine & Primary and Amsoil Gear in the Trans. I did a lot of research and it seems like a good combination.
 
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Old Feb 17, 2007 | 07:29 PM
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Default RE: Primary oil
What AtkRWC said. I think Mobil 1 is fine tho.
I do believe that using a sythetic gear oil is a good idea.
Both my bikes shift noticeably better. I had a tough time finding
nuetral in the 07. Switched to Amsoil 75-90 and there was an
immediate improvement.
 
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Old Feb 17, 2007 | 07:37 PM
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Default RE: Primary oil
called amsoil several years back and they said go lighter in primary(10/40). read somewhare fossil good for primary. have noticed very very faint seapage on my sprtsr but its just a back up bike low miles just sites
 
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Old Feb 17, 2007 | 08:55 PM
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Default RE: Primary oil
ORIGINAL: voodoodrug

called amsoil several years back and they said go lighter in primary(10/40). read somewhare fossil good for primary. have noticed very very faint seapage on my sprtsr but its just a back up bike low miles just sites
Amsoil states that they use no friction modifiers in their products so they are fine for the primary.I have heard some say to use Dino in the primary but haven'theard of anyone complaining about Amsoil causing issues. Not sure about the 10W/40, they seem to recommend 20w/50 now. All in all, each rider needs to do their own research and go with what they are comfortable with using.
 
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Old Feb 17, 2007 | 09:59 PM
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Default RE: Primary oil
All of the above.
 
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