I just finished switching out my PS pump and realized that the PO had run ATF and I just bought PS fluid. Are they compatible or do I need to flush my system before running the PS fluid or should I just get some atf and run that? Dex 3?

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1981 240D 143k 4 spd manual -SOLD

2004 VW Jetta TDI 5 speed 300k -still driven daily