03-04-2025, 10:56 PM | #3 |
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Castrol SRF. It is one of the best in the industry, with one of the highest wet boiling temperatures.
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03-05-2025, 12:23 AM | #4 |
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I used RBF660 in my F87 Comp. Never let me down. Using it in the G87 now as well. However, SRF (pricey) and Torque(when you can find it) are probably the best in the biz due to fantastic wet boiling points.
I'll probably switch to either one when my case is done. ![]() |
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03-05-2025, 11:50 AM | #5 |
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If you are too lazy to flush after each event, the SRF will still have a very high wet boiling temperature, whereas the others don't.
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03-05-2025, 06:03 PM | #7 |
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I’ve been using the RBF 600 for many years until I discovered the Ferodo Super Formula, which to me is much better at everything.
Both are DOT 4, so you avoid the problems of the DOT 5, but in my experience the Ferodo has better resistance to high temperatures and degrades better over time. |
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03-05-2025, 07:56 PM | #8 |
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G87 and all new BMWs are designed for low viscosity brake fluid. The ABS pump won't work as fast with thicker DOT 4 fluids. You should use DOT 4 LV / DOT 5.1 or Bosch ESI6 for street use.
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03-06-2025, 08:57 AM | #9 | |
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Your answer would have prevented me from using the Ferodo DOT 4 for the new M2!! |
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03-06-2025, 12:05 PM | #10 | |
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BMW have actually specified LV fluid for more than a decade now, as have Porsche. Best to swap between LV fluid for winter use and non-LV fluid only if needed for track use. With a manual car, non-LV fluid will also cause more intrusive CDV (Clutch Delay Valve) delays in the clutch pedal return, if the valve hasn't been removed. |
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03-06-2025, 02:56 PM | #11 | |
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03-06-2025, 07:32 PM | #12 | |
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If you aren't tracking, you are probably better off just changing the LV fluid every year. Unless you are really torching the brakes on a track, fresh fluid has nearly the same 'dry' temp limits as track fluids, and will work just as well. And if you flush every year, it will never get 'wet'. |
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03-08-2025, 06:10 AM | #13 | |
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The problem is usually more of summer temperatures, which reach 30ºC (86ºF) or 35ºC (95ºF) and overheating of the brakes in track. However, in central Spain, it is easy for temperatures to drop below 0ºC (32ºF) in winter, and yet I had never read any problems with low temperatures with brake fluid. Very interesting, in any case! Thanks for the information! |
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