Dry heat is still heat! We're 90+miles north of Phoenix, so it's a little less dry here. Still can't figure how so much water got in my ladder--must be condensation. You can certainly beat the cost of your local rv dealer for an oil change. I buy the oil and filter at walmart, crawl under (it's high enough for me without ramps) drain the oil, change the filter (it's in a convient location and easy to change and fill up with new oil in less than 20 minutes. While I'm under there, I also lube it since I have the time--and all for less than $20.