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Over the counter API-GL4

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First, I apologize if this has been answered. I'm trying to track down a over the counter API GL-4 gear oil for my 21' TXT300. My options are pretty limited to auto parts stores as I've already been to the local dealership.

With KTM overseeing the production of GasGas, they only list the motorex brand gear oil in the manual. Nothing against motorex but between the cost of the oil, taxes, shipping, It's almost $40 for a quart of oil. 

 

 

Would this work? It's rated API GL-4 & GL-5 so it meets the criteria.

https://www.oreillyauto.com/detail/c/max-gear/oil--chemicals---fluids/maintenance-chemicals/lubricants/gear-oil---additives/75w-90/1e1e9866791f/royal-purple-max-synthetic-gear-oil-75w-90-1-quart/ryp5/7590/v/a/137956/automotive-van-2016-toyota-sienna?pos=2

 

Thanks in advance.

Looks much too thick to me, My favorite is a Motul Transoil 10W30, ATF seems to work fine as well on my 2012 Gas Gas 280. I also make sure it does not have the energy conserving stamp on the back, whether it is true or not,  I have been told it is not good for the clutch?

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