mixing brake fluid

[foxxinabox at wideopenwest.com (Foxx (in a box))]

   i needed brake fluid a little while ago and bought some prestone 
synthetic dot 3 out of haste. i recently, without checking what i had, 
bought some castol gtlma due to the higher boiling points. only thing is 
that the castrol doesn't say synthetic on it. ideas on if i will have a 
problem? car in question is simply a lowly '85 8v. thanx.

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