Thank you!
I'm really looking for 5W-40 though, and that is very hard to find. One place, AutohausAZ (sp?) has it for almost $9/quart. I didn't even bother checking tax and shipping.
We have a fully loaded (11,000+ lb) Winnebago View. Between the weight, wind resistance, and mountain driving I often have my foot on the floor (or using engine braking). I don't abuse it, but I run it hard. In short, we don't fit the profile of the "typical" RVers doing 20-under and leading a parade of irate drivers. My "other car" is a modified WRX.
I mention all that to explain why I don't just go with 5w30. That would clearly be easier. I probably could use it without the engine becoming shrapnel, but 5W-40 is what was originally recommended. Also, since we bought bought it used in 2012, it has burned a significant amount of oil -- about 2-3 quarts during the 10,000 mile OCI -- and that's with 5W-40.
If it was in light duty service I'd feel more comfortable using 5w30.