Paranoid New Owner of an 03 6MT
On another note, I've been in touch with Rockland Standard Gear, a supplier and re-builder of transmissions/diffs/transfer cases for many OEM's and race teams. They told me any 75W fluid will be tough to shift when cold. Suggestions were to use GM/Dodge synchromesh. I'll be mixing 1/2-quart with the OEM fluid. Synthetics are not always recommended, some are too slippery to provide bite for the synchros to work properly. If you stick with a GL-4 spec oil or less and avoid putting GL-5 you'll be fine.
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I do not understand why you are so head-strongly determined to put something other than the OEM fluid in, even to the point of concocting some witches brew (never a good idea to blend different fluids). It is well documented that Nissan transmissions are finicky in their need to use the Nissan fluids around which they were designed as a system. Multiple posters here have said this. You are paranoid about longevity and yet you are hellbent to do something against advice which will almost certainly ensure your fears are realized. 
If your shop doesn't focus solely on Nissans they will definitely point you in the wrong direction OP. If I need help I call the aftermarket performance places or there is one Infiniti dealer in Cali with a large performance parts department I don't remember the name of it.
You may not experience it because you have lower mileage, or the driving conditions in your area (weather, length and type of driving, etc).
My 05 with 116k miles has the clutch pedal sticking although the clutch master is brand new (fluid also). In the humid hot weather it starts to happen after a few minutes of driving, esp in the daytime in the city. When the engine is cold and you first start the car (like in the morning), the clutch pedal feels good, but with prolonged driving esp in hot weather it starts to stick halfway.
My 05 with 116k miles has the clutch pedal sticking although the clutch master is brand new (fluid also). In the humid hot weather it starts to happen after a few minutes of driving, esp in the daytime in the city. When the engine is cold and you first start the car (like in the morning), the clutch pedal feels good, but with prolonged driving esp in hot weather it starts to stick halfway.
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G35 Coupe 6MT
You may not experience it because you have lower mileage, or the driving conditions in your area (weather, length and type of driving, etc).
My 05 with 116k miles has the clutch pedal sticking although the clutch master is brand new (fluid also). In the humid hot weather it starts to happen after a few minutes of driving, esp in the daytime in the city. When the engine is cold and you first start the car (like in the morning), the clutch pedal feels good, but with prolonged driving esp in hot weather it starts to stick halfway.
My 05 with 116k miles has the clutch pedal sticking although the clutch master is brand new (fluid also). In the humid hot weather it starts to happen after a few minutes of driving, esp in the daytime in the city. When the engine is cold and you first start the car (like in the morning), the clutch pedal feels good, but with prolonged driving esp in hot weather it starts to stick halfway.
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You may not experience it because you have lower mileage, or the driving conditions in your area (weather, length and type of driving, etc).
My 05 with 116k miles has the clutch pedal sticking although the clutch master is brand new (fluid also). In the humid hot weather it starts to happen after a few minutes of driving, esp in the daytime in the city. When the engine is cold and you first start the car (like in the morning), the clutch pedal feels good, but with prolonged driving esp in hot weather it starts to stick halfway.
My 05 with 116k miles has the clutch pedal sticking although the clutch master is brand new (fluid also). In the humid hot weather it starts to happen after a few minutes of driving, esp in the daytime in the city. When the engine is cold and you first start the car (like in the morning), the clutch pedal feels good, but with prolonged driving esp in hot weather it starts to stick halfway.
Honestly so far the only issue is the notchy shifting especially when cold. I'm really surprised given the amount of complaints about cold and notchy shift problems on these trannies no one has tried neither GM synchromesh or Castrol Syntorq given these are actually labeled as specifically for 'cold shift problem solving' and given the fact that many Honda/Mitsubishi/Toyota/Subaru with the same issues on other forums have praised them
But it doesn't. Mine only sticks on really hot days, and when I'm in stop-n-go traffic. I have a new clutch master cylinder and fresh fluid.
Ever seen a video of a header on a dyno? When u go WOT that usually when it sticks for me. I have a wilwood master and braided cable I still hadnt installed after buying it almost a year ago.
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