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You need either Dot 3 or Dot 4 brake fluid for clutch cylinder. If the old oil in clutch cylinder oil container is red or yellow then its Dot 3 and if its Clear like water then its Dot 4. Never Mix dot 3 and dot 4 oil. Check your vehicle owner manual for correct type of oil.
For bleeding you need to open the valve near the brake caliper till all the air inside the fluid pipe is released and oil starts dripping. Also add fresh oil in clutch container so that you don't create air gaps while bleeding.
The brakes and clutch share the brake master cylinder reservoir,and a line from clutch master cylinder goes to the brake reservoir and it takes brake fluid,dot 3 type.
When was the last time you had the clutch fluid flushed and replaced. The fluid takes quite the beating compared to brake master cylinders. If it has dot 3 or 4 fluid it should look like vegetable oil. If not replace it and bleed the system. If it's dot 5 It should look purple or very dark . If it's dot 5 and it looks light in color or clear replace it and bleed the system.
All the above answers saying to use a DOT or other fluids are wrong.
Never use DOT-3 or DOT-4 based fluid in a system equipped for Magura's Blue Blood or Vitamol V10 mineral oil. Using DOT-3/DOT-4 fluids will likely cause seals to fail in your clutch or brake cylinders.
To answer your question: yes, I believe both Blue Blood and Vitamol V10 products are equivalent SAE10 weight mineral oil.
Do NOT add brake fluid to the clutch reservoir. The BMW clutch uses mineral hydraulic fluid which will not mix with brake fluid.
If your fluid is dropping, the chances are good that the slave cylinder is leaking. If not attended to soon, it will eventually contaminate the clutch, which will then also need to be replaced.
The problem is either the clutch master cylinder or the line going from the master cylinder to the clutch slave cylinder.Put some DOT 3 or4 brake fluid in the cylinder under the hood and have some-one look at it while you push the clutch pedal down a couple times. You should be able to see where it is you are losing the fluid.
Do not put oil in this system.It uses brake fluid in the reservoir.If the system doesn't have any fluid in it, there is a leak, and both the clutch master cyl and the clutch slave should be replaced. They both were used the same amount of times, and wear evenly. When you add fluid, the clutch master cyl compresses the fluid down the line/hose into the clutch slave cyl. This depresses the clutch fork/arm and disengages the clutch disc so the input shaft into the transmission stops moving, allowing the trans to be put into gear. LOOK FOR THE FLUID LEAKING TO ISOLATE THE PROBLEM. This is a closed system, and the fluid never gets used, unless there is a leak.
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