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Old Apr 24, 2012 | 06:20 AM
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2012 FLHX i think... I have used Amsoils 20w50, Mobil 1 20w50 and finally just went back to HD Formula plus...really not much difference to me, all about the same....Main thing is actually changing it.
 
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Old Apr 24, 2012 | 06:37 AM
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I think I've tried everything except used motor oil and I have found HD Formula plus to be as good as anything.
 
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Old Apr 24, 2012 | 07:04 AM
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I run Amsoil 20/50 in the Motor, Amsoil 75/140 in the Tranny and Harley Formula Plus in the Tranny! Bike is nice and quiet and runs perfectly with this combo.
 
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Old Apr 24, 2012 | 07:33 AM
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Amsoil 20-50 in the motor - Spectro heavy duty 6 speed in the tranny - and formula + in the promary. Works for me.
 
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Old Apr 24, 2012 | 08:19 AM
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Mobil 1 20w50 V-Twin in the engine, Bel-Ray Primary oil in the primary and Redline Shockproof in the tranny.

I was using Mobil 1 Racing 4T 10w40 in the primary but swapped it back out for the Bel-Ray. The Bel-Ray just has a great feel to it, very smooth engagement and a positive lock-up.

Plus the Bel-Ray is red, if you get a leak it easier to tell what is leaking.
 
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Old Apr 24, 2012 | 08:29 AM
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Engine: Mobil 1 V-Twin 20w50
Primary: Mobil 1 Racing 4T 10w40
Tranny: Mobil 1 Gear Lube 75W-140
 
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Old Apr 24, 2012 | 08:35 AM
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Engine: Mobil 1 V-Twin 20w50
Primary: Mobil 1 Racing 4T 10w40
Tranny: Mobil 1 Gear Lube 75W-140 +1
 
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Old Apr 24, 2012 | 08:46 AM
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viscosity is measured differently on gear oil, vs engine oil. a 75/90 wt gear oil has almost the same viscosity as 20/50 enigne oil.

now having said that, i wouldn't use it in the primary....... ymmv
 
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Old Apr 24, 2012 | 09:12 AM
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I use Red Line Synthetic Primary 75W80.
 
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Old Apr 24, 2012 | 09:33 AM
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Originally Posted by 37sportster
Hi all, i just read on here the other day that some people are using gear lube in their primay. I've heard of this in the tranny, but not the primary. Any thoughts on this? What are you guys running?

Idiots are born every day so there's always a fresh batch.
Motor oil, HD Primary oil and ATF are great choices for the primary.
Gear Lube....not so much.
 
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