Recently started noticing that 3rd gear grinds upshifting anywhere over 4500 rpm and the grind gets worse the higher up the rpms are. The car does not grind when downshifting into 3rd regardless of how aggressive of a downshift, just when upshifting. Car is a 2011 with 62k miles. I changed the gear oil to Redline MT-90 roughly a week ago now and have noticed little to no change. What are the odds that it's the synchro?