Has been some time since I posted, thought I would return w an interesting note:
No intent of creating a bunch of gear oil stink or a 7 page banter- just wanted to share an experience.
My 87 veloce has the ever so typical 'take it easy shifting' synchro's so I dumped whatever the prior owner put in it (probably Castrol gtx 20/50-lol) and went to the new generation shell spirax gl-5. Shifted better...not too shabby.
Then dumped the spirax to try out the redline ns stuff and initially it felt good but progressively got crunchier and crunchier to the point where I wondered if I even had any gear oil at all! It leaked like a stuck pig so was ready to go back to dino-oil to perhaps slow the leak.
With that and the fact that I'm OCD I then tried out (don't freak out) Mazola Corn Oil ----just kidding---I then put Brad Penn Classic GL-4 which specifically does not have any friction modifiers. I know...no EP protection (it likely does but less than GL5) but I don't drive this old 135k mile car hard so was not worried just to try. The Porsche guys with their 80's 944's many swear by it and I thought the worst that could happen is it felt worse and I would go back to spirax.
Interestingly- Low and behold the Penn Classic GL4 has resulted from the best feeling shifts since I have owned the car.
I do understand my tranny is ready for a rebuild/reseal soon but I can pause between 1-2 upshifts and blip throttle on downshifts and it shifts pretty well. Just wanted to share this because I have obviously fallen prey to the gear oil dialogue over-analysis (as many have) and was very happy with the GL-4 Penn Classic which has not been discussed to any degree thus far- obviously because factory did not recommend and the redline ns movement is so strong currently .
I'll report back if things improve even more over time or degrade but I thought this was very interesting.
One thing I cannot seem to find is Alfar7 once noted that the approx. 2 pint fill spec was too much and recommended another amount- anyone remember what he said? I'll send him a PM if no one does.
Thanks again all- still love our old spider with all its flaws....
Best to all in 2018-