A trip to my local wal-mart in search of some good oil yesterday led to a couple options I haven't seen addressed here yet. The only Rotella on the shelf was the new stuff. No surprise, as this is a pretty densely populated area and their stock must move pretty quick.

However, they had a Castrol 15W 40 with the zinc-whatever-phosphate, rated CJ-4 & CI-4 plus, The label still said it's safe for use with cats, so I don't know exactly how much zinc was in there.

Also, there were plenty of quart bottles of Motorcraft 15W 40 diesel oil, rated CI-4 plus. No mention of CJ-4 on the label. For you guys looking for oil that can't find Rotella, the Motorcraft oil might be a good option.