370z manual grind?

Legone370z

Hi Folks,
Just an update on my 2012 370z MT6. It has been ~4,000 miles since NISSAN put a new transmission in my car. The car has ~11,000 miles on it now, it is shifting beautifully with no grinding ever.

I do experience stiff shifts from first to second when the car is cold (this is relative to outside temperature). One dealer tried to scare me saying "you will void your warranty if you use anything other than Genuine NISSAN Manual Transmission Fluid (MTF)". I have extended warranty so did not want to jeopardize my coverage changing to something else (Full Synthetic). Note: I would change to a Full Synthetic in a heart beat because shifting is always the same whether it is cold or hot (not temperature dependent).

Since transmission replacement, I have been shifting the transmission as NISSAN recommended. That is when shifting up through the gears I use ever single one all the time.

I have had too many manual transmission vehicles to mention them all. Some of the vehicles were old(er) some were new. There were 3, 4, 5, 6 and seven speed manuals. Transmissions and shifting in all those vehicles could best be described as:

* Like a sewing machine (Mazda Miata (4), MGB (2))
* Notchy
* Deliberate (BMW 3 series)
* Stiff
* Clicky (Honda 750 F1)
* Sticky
* Long throws (a truck)
* Loose (worn out linkage)

What was not present in any of my past vehicles was GRINDING.

Sincerely,
Legone370z