Hello,
when it's cold outside and my car is freshly started i have a problem to gear up to 2nd gear. Just when the motor gets a bit warmer then gear change is without problems. Until now – specially in summer – gear change was not a problem even when motor is cold. My question – would it solve the problem if i have used oil with less viscosity? If so could you please recommend any specific kind? Or if you have any other solution could you please advice?

Thank you.

 

Redline MT-85

 

Get fully synthetic gear oil and make sure you're not putting in a higher weight than it calls for.

 

Both of the above. ^^^

Redline MT85 or Nissan GL-4, 75W85, no thicker, no thinner.

While you're at it, take a good look at the rear seal, could be that you're simply low from a leak and the gear change putz just started happening coincidental to the temp drop.