I think the power steering has alot to do with it. Its pretty much the only fluid I have had to put in in over 5 years of ownership. I have to put a small amount in every 2-4 months.
Today, after adding fluid on Saturday and having the car run whine/rpm issue free, I was stopped in drive, letting my wife out at work and all the sudden, rpms start to dip, sound returns, I turn wheel side to side and sound increases with each turn. Ialso want to see if i can add Dexron Mercon ATF to the resevoir cap eventhough I have been putting basic stp steering fluid in previously.
Ive had a few checks on my ecu in the past but my car in the past 5 years has never thrown a code thankfully. Thanks man