My shifting seems to be bad, and it's getting worsen day by day. I suspected the Arrow shit gear oil is the culprit (I might be bias towards my shifting capability :P) and I was even shocked because it was labeled as GL-5 gear oil (just google why GL-5 oil should never been use in a GL-4 application). Curses and blaming aside, I asked around which GL-4 gear oil is the best and always available on the shelf? Only these two brandnames were popped many-many times; Motul and Redline. After a long internet reading regarding these two products, finally i chose Redline MTL®. Being a Group V Synthetic (Ester - the thing that naturally able to cling to metal surface) and it was 7 bucks cheaper than the overpriced entry-level Motul mineral gear oil (bought at Eneos OU). 
When it comes to gear oil, you don't want it to be too slippery. Sounds a bit odd but it is true though. The synchronization of shifting gears requires friction to transfer energy from the synchronizer, which is locked to the input shaft, to its mating surface attached to the gear to be locked in as the drive gear. Few modern transmissions use sliding gears to change gearing other than for reverse gearing. Synchromesh transmissions have the gear pairs constantly in mesh. The time this process takes depends on how easily the synchro ring moves and the rate of frictional energy transfer between the two synchronizer surfaces. Higher viscosity lubricants slow the sliding of the synchro ring on the input shaft and require a longer time for the oil to be squeezed out from between the mating synchronizer surfaces. After the lubricant is squeezed out, the coefficient of friction of the lubricant determines the rate of frictional energy transfer between the two surfaces. Slippery lubricants such as hypoid gear oils and ATFs can take too long to synchronize the gears, which promotes synchronizer wear.
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