The Valvoline juice was OK, but the system still howled when temps hit about -30°. First year with Lubegard it didn't howl past -40°.
I noticed that hydroboost systems are a bit harder on fluid than conventional steering assist systems. I flush every couple years and top off with Lubegard. I use 1½ bottles of Lubegard due to the slightly higher capacity.


My brother has a Ford Explorer. After replacing both the rack & pump it had a nasty whine. Dealer said normal. He sucked down the reservoir, started the engine and added Lubegard. The whine stopped before the bottle was empty.

 

When my 99 did this I added some Lucas PS stop leak. It quieted down in about 30 seconds and hasn't made a noise since.

Chris

 

my wifes 97 jeep had morning sickness when cold. i just flushed with clean fluid and replaced with regular fluid and cured the problem fluid was real dirty though.