DisQueen said:
I don't know about oxygen use in the park, but electric wheelchairs are available for rent. They are available where strollers are rented.
They have ECVs (which stands for electric convenience vehicle). Those are a bit different than electic wheelchairs (which are not able to be rented onsite at any Disney parks). ECVs have a "tiller" to dirve them and are pretty easy to get the hang of. Electric or Power wheelchairs drive with a joystick. They are not as intuitive to learn to drive as ECVs are and require quite a bit more practice. They are not for rent in any of the Disney parks and are usually not for rent from off-site places either unless you already are exerienced driving one (many people might rent one because they don't feel comfortable traveling by plane with their own power wheelchair).
This is a
link to the Disneyland Park's mobility disability page. They don't really have a page that meets your needs with oxygen specifically, but I thought this one might be helpful since you have mobility problems too. There is a link on the right side to download the
Disneyland Guidebook for Guests with Disabilities. It doesn't really have much pertinent to your oxygen questions either, but is the only written information they have.
There is also a "Contact Us" link near the bottom of the page. I have had pretty good luck with emailing questions about WDW to the address on the Disney site. Just put something in the title or first few words that indicate you need disability information.
And, as was already suggested, you may wnat to visit the disABILITIES Board. Even though most of our posts are about WDW, there are some people who go to both parks and might be able to help you. Plus, the policies should be pretty similar at the different sites, so what people have found at WDW should be helpful info for you at DL.