DOT 4 Low Viscosity?

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Mar 30, 2009
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VW bought my TDi Jetta back. I have several quarts of ATE SL.6 brake fluid left. It is DOT 4 but "low viscosity" per VW spec. Any issue in using it in my 80 series? I know DOT 4 is fine but curious about the low viscosity part. I also realize service intervals on DOT 4 are more frequent than DOT 3, but I change it about once a year anyway. Thanks!
 
No one answered so I figured I would post what I found out. Pentosin says you can use low viscosity in place of regular fluid but you should never top off a system that requires it with regular fluid.
 
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