Manual Transmission Fluid Check
Perform recommended fluid checks and changes at regular intervals according to the vehicle manufacturer's recommendations and specifications. Under severe conditions such as heat, cold, or dirt, the fluid should be replaced more frequently. Replacing transmission fluid can improve shifting and extend the life of the transmission.
Check the fluid for condition and level through the transmission drain plug. Check with specifications if unsure about the fill and drain plug locations. Many drain plugs incorporate a magnet to collect any metallic debris circulating in the fluid and collecting in the sump. Inspect and clean these drain plugs before replacement. Fill the transmission to the base of the fill plug opening.
If excess metal is found on the plug and in the oil, it's most likely from worn gear teeth. Most synchronizer blocking rings are brass. Because brass is not magnetic, it doesn't appear on the magnet but shows up as the fluid is drained. If excessive brass is found towards the end of the draining cycle and the vehicle is suffering from hard shifting, the blocking rings are likely worn.