I sold a used refrigerator on ebay and want to demonstrate to the
buyer that it's still working as shown in the ad. It's my
understanding that if you lay a refrig on its side you're supposed to
wait a day before you fire it up to allow the oil to drain back out of
the lines into the compressor. Are there any potential issues with
laying it down or even transporting it upright immediately after it's
been turned off?

Thanks for all info.