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I'll pass. To begin with, used motor oil is a carcinogen and since I do my own maintenance, I try to avoid contact with it as much as possible. Next is the fact that oil attracts and holds dirt, including salt if you live in a state that uses it for winter driving. Nor will the oil stay in place long. It is a liquid and on a vertical surface it will quickly run off leaving no protection. Last, I use oil films as a method of determining leaks that need to be repaired. Pretty hard to spot them if the whole undercarriage is covered.
If you want to prevent rust, have your frame/undercarriage coated with rust proofing. It makes it miserable to work on afterwards, but will far better than used motor oil and is more environmentally friendly than used motor oil.
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