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I have a serious question. As I am rather new to this, I was wondering if Gear oil and Transmission fluid are the same thing? From the research I've done, they go in the same place, so would it matter if i used one or the other say on a '01 Celia GT-S 6 speed manual. I am very confused on this topic.
 

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Use Redline Lighweight Shockproof gear oil. Skip the Royal Purple for the manual transmission on our cars.
 

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Royal purple and Mobil 1 eats thru our synchros from what I read, I know when I was using Mobil 1 my gears started grinding every now and then, when I switched to redline the grind was gone
 

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You have to be careful with the version of Royal Purple gear oil you get. They put a limited slip additive in some of them and that will wreak havoc in a manual transmission.
 
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