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Heck, you could always put an expansion plug in the intake, too keep them from starting it. Probably take less time than draining the filters.
Might as well remove the drive shafts too.
It doesn't matter what you do, if someone wants it, they will get it. All you can hope to do is slow them down. Locking the steering wheel and a hidden battery cut off are about as far as you should practicly go.