Clutch and transmission fluid

pbs370z

My clutch kit from Zspeed came with the Motul "Gear 300" 75w90 fluid. Has anyone used this stuff (in the tranny) and did you find it to be an improvement?

I hesitate to put it in as someone who posted here (see below) said the fluid became "gummy". (I find it a little hard to believe). I would like to hear of personal experiences using this stuff.

tia

"Gummy post"
Clutch flywheel combo?
"From about 2 months I upgraded my clutch to South Bend Stage II Daily combo + Silent Disk + ZSpeed CSC + Motul Gear300.

Two note:
After 1400Km, I must return to the Stock Nissan Trans Oil (75W85 GL4), the Motul at first was good, but after some Km starting to be "gummy". In some UK forums, suggests also to buy Moly Slip additive. I bought also this, but the effect (at now) is very impercettible...."

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'10 Z, Sport Pkg 6 MT, Stillen Brake Cooler, Z1 Oil Cooler w/Setrab 25 row/Mocal T-stat, Southbend Clutch w/light wt Flywheel.