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post #1 of 25 (permalink) Old 10-29-2018, 04:55 PM Thread Starter
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M8 Oil Change Question

Time for the 1000 mile service on my 2018 RG. In the Ultra's i had previously i used Amsoil V Twin oil in the primary and engine and Amsoil transmission fluid. Has anyone tried the Amsoil V Twin primary fluid? I just noticed they offered this and was wondering if it is worth trying.
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post #2 of 25 (permalink) Old 10-29-2018, 04:58 PM
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Yes, Ive used it since it was introduced, works very well! Same goes for the V-Twin Transmission Fluid.


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post #3 of 25 (permalink) Old 10-29-2018, 08:06 PM
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I use Redline, but you can't go wrong with Amsoil (in any of the holes).

Once I make up my mind, I'm full of indecision.
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post #4 of 25 (permalink) Old 10-29-2018, 08:43 PM
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Engine and transmission synthetic is recommended, however avoid the synthetic in the primary. Formula+ for me.
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post #5 of 25 (permalink) Old 10-30-2018, 06:58 AM
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The Amsoil Primary fluid works great. If you are an Amsoil member and like to buy your fluids from them it's the way to go. We can go on and on about all the different brands that are great choices but to answer your specific question and not get off on yet another oil thread debate, yes it is certainly worth trying.
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Last edited by RGKen; 10-30-2018 at 01:23 PM.
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post #6 of 25 (permalink) Old 11-01-2018, 12:09 PM
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Yep I use the primary oil on my beastie no problems.


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post #7 of 25 (permalink) Old 11-30-2018, 03:55 PM
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Quote:
Originally Posted by Desertwndrr View Post
Engine and transmission synthetic is recommended, however avoid the synthetic in the primary. Formula+ for me.
I thought it was synthetic in the engine and primary and Formula+, Redline, Amsoil Transmission or similar in tranny

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post #8 of 25 (permalink) Old 12-06-2018, 06:52 PM
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Originally Posted by Erilflynn View Post
I thought it was synthetic in the engine and primary and Formula+, Redline, Amsoil Transmission or similar in tranny
You can use synthetic in all three holes. H-D actually recommends the same oil in all three. Not trying to start the debate. Do what you wish but if you are out and about and NEED to put something in grab some 20-50 and go to town.


Edit to add, yes I have used Amsoil in my bike. I like it.

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Last edited by theduece; 12-06-2018 at 06:53 PM. Reason: added
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post #9 of 25 (permalink) Old 12-06-2018, 09:32 PM
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Quote:
Originally Posted by Erilflynn View Post
I thought it was synthetic in the engine and primary and Formula+, Redline, Amsoil Transmission or similar in tranny
it isn't so much to avoid synthetic in the primary, as it is to avoid any oil with friction modifiers as they will cause clutch slippage. synthetic in the primary is fine, although wasteful. hd recommends changing the primary every 10k. most do not go that long. i change mine at every engine oil change (5k).

if anyone cares, my recipe is:

mobil1 15w-50 for the engine
shell rotella t 15w-40 for the primary
supertech 75w-90 full synthetic for the tranny

the first 2 come in multi quart jugs, while the supertech is fine in the quart bottle. less than $50 for a complete oil change, including the cost of the filter.

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post #10 of 25 (permalink) Old 12-07-2018, 03:51 PM
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Not going to go wrong using any top tier name brand oils.

I personally like Mobil 1 due to the fact it's available anywhere you're at(Autozone, etc.). Amsoil is a little more tougher to find, especially on the road if you need a quart to top off.

This is what has worked for me:

Mobil 1 V-Twin 20w-50 for the engine & primary
Mobil 1 75w-90 for the transmission(noticeably quieter and smoother shifting)

Thinking this may reduce the possibility of transmission oil migrating to the primary on M8's, due to being thicker.
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