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https://www.amazon.com/Shimano-Internal-Hub-Maintenance-Oil/dp/B00O58QCQY

I know what it is for. But what is it composed of?

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  • Mainly it's simply oil with the right "weight" to be optimal in a geared hub. It also contains a bit of dye, presumably to help identify leaks. – Daniel R Hicks Nov 7 '16 at 1:04
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    If you're asking whether it's worth 63 bucks, probably not. But you'd have to figure out what the equivalent weight gear oil would be. – Daniel R Hicks Nov 7 '16 at 2:39
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I am not 100% sure for Shimano but my Rohloff Hub used SAE 80 weight gear oil. I can't imagine shimano has magic that isn't covered by the SAE standard.

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    I use many litres of ep80/90 in my old landrover, and it has a particularly distinctive smell. – Criggie Nov 7 '16 at 18:11
  • Here is a link to a blog post of a Shimano IGH rebuild that uses automobile automatic transmission fluid... 14degrees.org/shimano-alfine-8-speed-internal-gear-hub-oil-bath – dafew Nov 7 '16 at 19:35
  • Just because you could use ATF doesn't mean you should. I'm positive that using the wrong oil (okay, not using the branded right oil) will void the remaining warranty. – Criggie Nov 7 '16 at 21:28

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