Well, the all knowing computer at checker's listed prestone PSF as good to go in my rig. So I drained and topped off the reservoir with PSF w/ stop leak (I have a slight leak somewhere). After draining the red stuff, I kinda knew PSF was the wrong stuff but I topped 'er off anyhow. Then I confirmed w/ the owners manual that the steering system takes +4. Now I have power steering fluid remorse, and the bad project demons are haunting me. Am I okay w/ 1 qt. PSF in the system that wants +4? She sounded okay on the drive around the block.

 

The +4 is synthetic according to the label.