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The f33 BMW 420i

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madmadmax
Posts: 64
Joined: Mon Feb 02, 2026 9:01 pm

I need to change the brake fluid in my car, but I'm not sure if I should useDOT 4 LV or DOT 5.1. Any advice? Does anyone have experience with this or know which one would be best? I am grateful.
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landy_110
Posts: 30
Joined: Mon Feb 02, 2026 9:04 pm

Level 4 DOT
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madmadmax
Posts: 64
Joined: Mon Feb 02, 2026 9:01 pm

Is this something you've done before? If so, which brand would you suggest?
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TotalRecall4Cars
Posts: 51
Joined: Mon Feb 02, 2026 8:52 pm

Sure, but not on an F33; instead, I use a pressure bleeding kit; Castrol costs about £15 per litre, and BMW is another option.
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TotalRecall4Cars
Posts: 51
Joined: Mon Feb 02, 2026 8:52 pm

https://www.ebay.co.uk/splashui/challen ... S4xNA**aAi
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madmadmax
Posts: 64
Joined: Mon Feb 02, 2026 9:01 pm

Yes, I understand.
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