You can top off with any Dot 3 or 4. Just reduces the benefit of using SRF. True, I top off with SRF unless it forces me to open a $75 bottle just to use a wee little bit. That's when I just use some Motul600 or regular ATE.
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2018 F30 320iX Melbourne Red
2011 E90 M3 Monte Carlo Blue
2004 E46 M3 Imola Red
2000 E36/7 Z3 Steel Blue
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