The stuff I see in the parts stores around here is Valvoline. It is labeled as 'synthetic Dot3/4', but technically isn't all brake fluid synthetic? It is clearly labeled Dot 3/4 which SHOULD mean that it is Dot4 fluid. It'd have to be to be compatible with Dot4 which is a boil point rating higher than Dot3. Dot 4 works just fine in a system which has Dot3 fluid in it, it just will not be ALL Dot4 in the system and the BP would be closer to that of Dot3. IMO, if they just labeled it Dot4 and stated on the label that Dot4 supercedes Dot3 and is completely compatible with it, they would be better off. YMMV. For the record I still go to NAPA and get a bottle clearly labeled Dot4. To me and many others, synthetic brake fluid means silicone brake fluid, at least colloquially, which is actually Dot5 which is incompatible with Dot3,4, and new Dot5.1! I would not try to convert to Dot5 as it may not be compatible with the seals in the brake system and it is definitely more compressible than Dot4 which could affect ABS operation. The advantage of Dot5 is that it does not wick moisture. But, any moisture in the system will lay at the low points as well. FWIR if you REALLY want to go to Dot5, you need to start with a NEW, dry system from end to end.

posted by 66.149.8...

• Once again I say ..., Quasi, Thu, 22 Aug 2002 00:08:19
  • DOT 4 sources, Rod'899kT, Thu, 22 Aug 2002 23:43:30
    • Dot 4 common, Napa?....Car Parts?...Local stores NM, Jim Moncrief, Fri, 23 Aug 2002 08:15:22
  • Wow! One post where I think I know LESS after reading, EricG, Thu, 22 Aug 2002 21:11:45
    • How can blasting down the interstate ..., Quasi, Fri, 23 Aug 2002 12:24:25
      • The pads are always a bit in contact with the rotor., EricG, Sat, 24 Aug 2002 14:45:35
  • Squealing with PBRs, jg, Thu, 22 Aug 2002 09:00:59
    • Re: Squealing with PBRs, Robert Kaplan, Thu, 22 Aug 2002 10:29:06
      • But, why does squeal stop, JG, Thu, 22 Aug 2002 14:54:58
        • I don't know,, Robert Kaplan, Thu, 22 Aug 2002 16:30:46
    • Re: Squealing with PBRs, RS , Thu, 22 Aug 2002 09:38:47
  • NAPA, KeithG, Thu, 22 Aug 2002 08:14:07
  • synthetic dot 3/4 compatible is what i use..., shawn, Thu, 22 Aug 2002 08:03:09
    • WHAT????????????, nt moore, Thu, 22 Aug 2002 10:05:19
      • DOT 5 and DOT 5.1 are two different things..., shawn, Thu, 22 Aug 2002 12:42:39
      • That is an interesting question, Robert Kaplan, Thu, 22 Aug 2002 10:27:01
        • Synth DOT 3/4 is compatible with DOT 4 w/o..., shawn, Thu, 22 Aug 2002 12:44:34
          • It's **not** "Synthetic"!!, Stephen Goldberger, Fri, 23 Aug 2002 23:34:43
          • Do you really think, Robert Kaplan, Thu, 22 Aug 2002 13:41:59
            • odd, nt moore, Fri, 23 Aug 2002 00:45:40
              • I wonder, what about mail order autoparts people? nm, Jim Moncrief, Fri, 23 Aug 2002 08:22:04
                • Buddy,, Robert Kaplan, Fri, 23 Aug 2002 10:14:58
        • I think Valvoline needs to talk to the marketing geeks., KeithG, Thu, 22 Aug 2002 12:02:06 <-- Viewing This Message
  • Re: Once again I say ..., Andrew , Thu, 22 Aug 2002 00:40:30
    • Re: Once again I say ..., David G.Mills, Fri, 23 Aug 2002 18:18:04
    • Rumor control, Bob Davis, Thu, 22 Aug 2002 09:38:00
      • No Rumour.. pads were/are crumbling under use.., Andrew , Thu, 22 Aug 2002 12:04:29
        • I have only been selling and useing MM + Delux pads for, Jim Moncrief, Fri, 23 Aug 2002 08:11:16
      • Uh oh, Robert Kaplan, Thu, 22 Aug 2002 10:19:09
    • Re: Once again I say ..., Aaron Govatos, Thu, 22 Aug 2002 09:23:50
      • And once again I say..., Bob Davis, Thu, 22 Aug 2002 09:53:39
        • Re: And once again I say..., Todd D. Levy, Thu, 22 Aug 2002 20:44:27
          • I thought it was against the law ..., Quasi, Fri, 23 Aug 2002 12:27:57
        • Actually, Aaron said that. But there was a comment, RS , Thu, 22 Aug 2002 13:32:16
          • Here's a link to some 9k board discussion, RS , Thu, 22 Aug 2002 13:39:44

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