Originally Posted By: zanzabar
Just did PS fluid on a 2005 Focus, manual called for older version of Mercon and said specifically NOT to use Mercon V. But I really don't know one way or the other, a quick Google search seems to give the consensus of 'yes it's fine'.
BTW this was the worst PS fluid I've ever seen (only 80k miles), looked like Hershey's syrup and took about 5 drain and fills of the reservoir (an entire qt) to get it sort of reddish in color again. Might have to run another qt through pretty soon.
Not surprising, Ford PS systems tend to really beat up the fluid when they don't have a cooler.