The Dow-Corning documents I read in the '80s said, basically, just dump it in, no flushing required. Which is exactly what I have been doing since the '70s. Back then, DOT5 was "it", there was no 5.1, and the DOT / FMVSS numbers were solely related to boiling point, and 5 was max.

I am sure it doesn't stratify with the glycol-based stuff, but is that a problem? It sure hasn't caused me any, and this is on circle tracks, superspeedways, road courses, pro rallies, and drags over the course of damn near a lifetime. Not to mention untold millions of street miles!

I guess you pays you money and you takes your choice.

Repro of Dodge pickup (military) sticker:



Rick