Brake Fluid Comparison                   Approx Approx             BP After BP After       Fluid Dry BP Wet BP 3 Months 6 Months US$/oz. US$/oz/°F > DOT4             Dry Wet                 Castrol SRF  590 518 572 554 2.076 0.0144 0.0100 NEO Super DOT 585 421 544 503 0.983 0.0071 0.0089 Motul Racing 600 585 421 544 503 0.712 0.0051 0.0065 Wilwood Hi-Temp 570 570 284 499 427 0.496 0.0040 -0.0184 AFCO Racing (570 Gold) 570       0.500 0.0040   AP600 572 378 524 475 1.062 0.0084 0.0159 Ford Heavy Duty DOT3 550 290 485 420       Performance Friction Z-Rated 550 284 484 417 0.492 0.0047 -0.0182 ATE Type 200 / ATE Super Blue 536 392 500 464 0.295 0.0033 0.0036 AP550 531 261 464 396 0.648 0.0076 -0.0130 Valvoline High Perf. Synthetic 513 333 468 423       Motul DOT 5.1 509 365 473 437 0.675 0.0107 0.0125 ATE SL 500+             DOT 5 Spec 500 346 462 423       Castrol LMA 450 311 415 381 0.219 0.0547   DOT 4 Spec 446 311 412 379       DOT 3 Spec 401 284 372 343                                       Comments:                I found all this on the web and nothing is guaranteed to be correct.         Wet boiling point is measured at 3.5% moisture, typical for one-year-old fluid.       AP600 is not compatibile with any other fluid.             Ford HD DOT3 is cheap and good for racing but has a low wet boiling point.       ATE Type 200/Super Blue is recommended by BMW.           ATE SL is OE on many European performance cars.           Martel Bros. offers a 5% discount if you mention their web site when ordering.                       URL's for the above fluids plus other good info                           http://www.neosyntheticoil.com/bkfluid.htm             http://www.martelbros.com/wilwood/59.htm             http://www.afcoracing.com/products/getproduct.cfm?CategoryID=3&ClassID=28&SubclassID=93&ProductID=1868 http://www.racerpartswholesale.com/bkfld.htm           http://www.easystreet.com/~porsche/2c.html             http://www.muller.net/karting/docs/technical/brfluid.html           http://www.diac.com/~cguy1/bmw/text/FAQ/FAQ.13.html           http://www.c-edge.com/shotimes/SHO3brakefluid.html           http://www.panteracars.com/motul.html <<Very informative         http://209.19.107.64/ogshell/loadpage.pl?676+catbrak.html