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post #1 of 8 (permalink) Old 11-16-2015, 07:59 PM Thread Starter
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Full service questions

Hey guys, first post here. Bought a 15 RGS a few weeks ago and being the gearhead I am, I plan to do all my own services like I do on all of my machines. I am a mechanic by trade, on just about everything, from my farm equipment to the wind turbines I service at the day job. I am, however, new to motorcycle maintenance. Im sure its not much different from alot of the machines I work on, but Id rather be safe than sorry. I prefer to use Valvoline oil in everything I own. I have read alot of posts about oils through this forum and my question is can I use the same 20w-50 oil in the crank case, transmission and final drive? Or am I looking at different oils for each of them? Any help would be great and thanks in advance.
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post #2 of 8 (permalink) Old 11-16-2015, 08:08 PM
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Originally Posted by Mooseinthetub View Post
Hey guys, first post here. Bought a 15 RGS a few weeks ago and being the gearhead I am, I plan to do all my own services like I do on all of my machines. I am a mechanic by trade, on just about everything, from my farm equipment to the wind turbines I service at the day job. I am, however, new to motorcycle maintenance. Im sure its not much different from alot of the machines I work on, but Id rather be safe than sorry. I prefer to use Valvoline oil in everything I own. I have read alot of posts about oils through this forum and my question is can I use the same 20w-50 oil in the crank case, transmission and final drive? Or am I looking at different oils for each of them? Any help would be great and thanks in advance.
I use gear lube (red line with shock proof) in the transmission. It's safe to use that engine oil in all three holes but there's better choices. I also perfer synthetic
Oils over Dino.

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post #3 of 8 (permalink) Old 11-16-2015, 08:55 PM Thread Starter
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I would be using a full synthetic. If i chose to use a gear lube in the transmission, 75-140 is the correct weight to use? I'll look into the oil you mentioned and see if I can better educate myself on it before I pull the trigger on it.
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post #4 of 8 (permalink) Old 11-16-2015, 09:15 PM
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It sounds like you are mechanically adept. What I would suggest however is to invest in the Harley Service Manual. Your skills plus a $60 book and you will be good to go.
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post #5 of 8 (permalink) Old 11-16-2015, 09:15 PM
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Prolly any 20/50 synthetic in the engine is fine. They run hot. I use Mobil 1 in the engine, Mobil I gear oil in the trans for me.

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post #6 of 8 (permalink) Old 11-16-2015, 09:16 PM
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I would be using a full synthetic. If i chose to use a gear lube in the transmission, 75-140 is the correct weight to use? I'll look into the oil you mentioned and see if I can better educate myself on it before I pull the trigger on it.
Yes, 75/90, or 75/140 both work well. I prefer Red line shock proof lube 75/250 because it's thick enough to obsorb gear noise but flows like a 75/90 oil. Been using its for decades in many different types of gear boxes.
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2010 FLTRX , Stage 1, 13" Madstad, Mono tubes, SuperShox, Heritage style bars. Alpine CDE-HD149BT,Soundstream Picasso Nano Series PN4.520 , 5X7 and 6.5 Infinity Kappa speakers
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post #7 of 8 (permalink) Old 11-16-2015, 09:29 PM Thread Starter
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Great, thanks for the help everyone.
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post #8 of 8 (permalink) Old 11-16-2015, 09:45 PM
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Yes, 75/90, or 75/140 both work well. I prefer Red line shock proof lube 75/250 because it's thick enough to obsorb gear noise but flows like a 75/90 oil. Been using its for decades in many different types of gear boxes.
I agree with this 100%! A good 20/50 synthetic in the engine and primary and you will be good to go..
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