r/Karting • u/extreme_jon Rotax • 18h ago

Karting Question Rotax 125 Max Evo Gear Oil Recommendation

I know Rotax recommends XPS® KART TEC KART GEAR OIL but I’ve heard a lot of people say they use ATF because of friction benefits but you have to replace more regularly. What is everyone using?

I also know Rotax recommends 100 mL but see lots of people running less oil, as little as 60 mL. Is there any reason for this?

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u/wolemid MOD 18h ago

We run 40ml of oil. Change the oil each hour.

The reason we run less is that there is less oil, so less friction. Which means less power being sucked away

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u/extreme_jon Rotax 18h ago

Do you run gear oil or ATF?

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u/Jackster22 16h ago

Have you actually tested this on a Dino? You are probably looking at an increase that is within the margin of error...

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u/extreme_jon Rotax 12h ago

I have not tested this. I've heard this mentioned from Power Republic (YouTube channel) and I've read it on a couple of forums:

https://foxandsonkarting.com/rotax-gear-oil

https://forums.kartpulse.com/t/x30-which-gear-oil-is-recommended/6033

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u/Jackster22 7h ago

I guess if you are at the top of your game, 0.1hp does matter..