So there is NO Pennzoil Ultra in the area where I live...I did lots of searching online to find it and found that there was some on closeout at a Walmart in a nearby city. I paid for it online and picked it up at the store this morning for $5.00 a quart. I have two questions....one, I have seen (on this site) that Pennzoil Ultra has a high volatility, even as high as dino oil! is this true? and if so what would be the ideal oci for short trips stop and go and many starts per day?? Second question, how long is the shelf life on this stuff...I just changed my oil recently and am planning on running it 4000-5000 mi. So its going to be about 5-6 months before it gets changed with the PU. Is that ok for the shelf life? or will it be expired by then? THANKS!