Car has 111K+ miles. Started out driving in 40 degree weather, and as the car warmed up I noticed a rough "whining/squealing like" noise after shifting into each gear. No grinding or difficulty shifting from gear to gear, but once in gear the noise got louder as I accelerated. Put gearshift in neutral & accelerated, no noise. And the noise was "rougher" or more grating than slipping engine belts. As noise became louder turned around & returned home. Had driven for about 10 minutes. Checked online and haven't seen any required fluid change intervals for the MT. Concerned about doing serious transmission damage before I drive to my VW specialist 45 minutes away. I try to pay attention to my car's sounds, and this was a sudden surprise. Thanks in advance for any explanations.