How often do I need to change this

Also how often do I need to change the clutch fluid. Checked and mines black and obviously new dot 3 fluid is almost clear so anyone know how many miles? My guess is around 30,000.

 

30,000 sound like a good #. If the fluid is black or dark, I'd change it.
You can never go wrong changing any of the fluids more frequently. You get dirt, water, fine metal filings ( from normal wear) in all your fluids, so changing them is making your vehicle last longer.
I call it vehicle life insurance.

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