Low Oil Pressure After Running Hot

[FLHOE]

I drove to work today and it ran hot (about 235 degrees). I added a full gallon of antifreeze/water when I got home from work. Now the oil pressure is low when idling (about 30), prior it was always around 40 at idle. I checked the oil and it is full. Could running hot break down the oil??? Should I do an oil change to see if that resolves the issue?

Vehicle: 2004 Chevy Tahoe 5.3 with just over 90k. Coolant was fully replaced in 2008 and the RP oil change has 3500 miles on it.

 

[FLHOE]

Changing the oil corrected the low oil pressure. Now I am trying to figure out why my coolant was down a gallon. If there is no obvious leak where do I start to look? I did inspect the oil and there was no water in the oil.

 

[Rivieraracing]

I would crawl under your rigs and check your hoses for leaks and also the botton of the waterpump!!