Hi all
I wanted to update the thread letting you all know what I finally did.
After all your answers and my readings I decided to order a gear oil that I can buy in small quantities and could be as dense as STP. If you pour a bit of each one, they both looks very similar, concerning density. Definitely they are more dense than the 600W oils I have from 3 different Model A vendors.
https://www.restorationstuff.com/eco...oducts_id=1088
LUBO26 (Meropa 1500) from Restoration Supply Company.
I did the oil change yesterday, but couldn't test it because it was raining. I will go out today for a short test. Tomorrow I have to drive 30 miles to a model A club picnic (60 miles round trip).
After the weekend I will let you know if I have seen any difference when shifting gears. Nevertheless, I have seen I am improving and most of the times I am able to shif with just a small grinding or without. Let see if this more dense oil helps me on my learning curve.
Cheers
Daniel