Im def not stuck on purple. I think i have been using there synchromax product. They have a few and I forgot the names and i forget to look when i go home too lol. Ill double check. I dont mind buying anything I just want the best.

 

Redline MT-90 is the best. Be a man, go jack the car up and drain and fill. Takes ten minutes and minimal work. Cost is $30

 

Just so you know I've used Mobil 1, Motul, and now Im using NEO Synthetic. Mobil1 and Motul never got rid of the grind, Neo Helped a little, but now its starting to come back, I'm moving on to Redline and if that doesn't cure it I'm going to give in and either crack the trans open and build it, or swap to a 6 speed.

P.S. I road race quite often and change my gear oil out every 3 oil changes, or track day, so it can't be the gear oil getting old.