Valvoline SynPower 75W 90 Gear Oil - Harley Davidson Forums: Harley Davidson Motorcycle Forum
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post #1 of 19 (permalink) Old 05-21-2019, 04:40 PM Thread Starter
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Valvoline SynPower 75W 90 Gear Oil

Local Autozone has it on sale. Anybody use it, or have used it? Gonna change my tranny soon and was wondering if I should try it.
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post #2 of 19 (permalink) Old 05-21-2019, 10:57 PM
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I would stick with the 20w-50 that is widely recommended. I use Amsoil 20w-50 that is specifically meant for HD transmission. No, I do not sell Amsoil. Just been a mech for 30 years.

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post #3 of 19 (permalink) Old 05-22-2019, 06:34 AM
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Originally Posted by hd4evr View Post
Local Autozone has it on sale. Anybody use it, or have used it? Gonna change my tranny soon and was wondering if I should try it.


Its a synthetic gear oil. It will be just fine in the trans. I would recommend using gear oil in there over motor oil. I run amsoil v-twin transmission oil in my bike. Either way, the oil you mentioned will be just fine.


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post #4 of 19 (permalink) Old 05-22-2019, 02:57 PM
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Originally Posted by rfrisch View Post
I would stick with the 20w-50 that is widely recommended. I use Amsoil 20w-50 that is specifically meant for HD transmission. No, I do not sell Amsoil. Just been a mech for 30 years.

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The MoCo has finally caught up with decades of conventional wisdom and started recommending 80w140 synthetic gear oil.

Proper oil for the proper application.
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post #5 of 19 (permalink) Old 05-22-2019, 08:04 PM
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Red line has a special primary and tranny oil, for what it cost I can pay for the best.
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post #6 of 19 (permalink) Old 05-22-2019, 08:32 PM
Use Belray for tranny, Redline elsewhere.....

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post #7 of 19 (permalink) Old 05-22-2019, 09:34 PM
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I have been using 80-140 gear oil. Just purchased Redline V twin gear oil with shock proof to try - it's supposed to quiet the gear noise and help with clunking when shifting. I'll find out soon.

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post #8 of 19 (permalink) Old 05-23-2019, 12:19 AM
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Quote:
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I have been using 80-140 gear oil. Just purchased Redline V twin gear oil with shock proof to try - it's supposed to quiet the gear noise and help with clunking when shifting. I'll find out soon.
Run lighter oil in primary, helps shifting and 1st. gear clunk. 10-40 Castrol Motorcycle oil good for clutches.

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post #9 of 19 (permalink) Old 05-23-2019, 01:01 AM
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I use ATF in the primary. Just like NP207/208 transfer cases.

And not that I've ever had any leaks on this bike, but if I did, I would be able to tell straight away where the leak is coming from.

Red = primary.
Sulphur smell from gear oil = transmission
Normal oil = engine.

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post #10 of 19 (permalink) Old 05-23-2019, 06:40 AM
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Quote:
Originally Posted by SoftailBilly View Post
Run lighter oil in primary, helps shifting and 1st. gear clunk. 10-40 Castrol Motorcycle oil good for clutches.
I'm running ATF in primary now.
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