Yeah, replacement seems to be the consensus. The Valvoline web site says
Synpower is compatible with conventional fluids, but who knows, that could
be marketing.

OK, next question. Can you bleed the brakes by yourself using compressed air
through the top of the bottle and opening each outlet at the wheels
individually? I don't have anybody to pump the brakes for me.

For checking exhaust leaks, I took a rubber stopper with a hole in it, like
the ones you stick into carboys, and ran compressed air into the exhaust
pipe.  It worked great along with soapy water at all the joints. I'm
thinking the same device would pump out the brake fluid quite nicely.

Not?