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My apologies on the "mineral-based" error. I've always heard them described this way, but looking this up after Jim's reply shows that "mineral oil" is or was used as a brake fluid in some applications, but "DOT3" and "DOT4" are typically not mineral oils, but glycol-based fluids. As for mixing of DOT5 and DOT3, I've seen this happen several times, and the result is usually many small, white-ish waxy globules. I found this quote which may explain why this happens: "If silicone is introduced into an older brake system, the silicone will latch unto the sludge generated by gradual component deterioration and create a gelatin like goop which will attract more crud and eventually plug up metering orifices or cause pistons to stick." So, perhaps this isn't caused by fluid incompatibility at all, but silicone incompatibility with this "sludge". __________________________________ Do you Yahoo!? Take Yahoo! Mail with you! Get it on your mobile phone. http://mobile.yahoo.com/maildemo ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~