You did not mention what the unit is, and how much they are asking for it.
Have you checked NADA? have you shopped private party sales? In other words are you sure, it is that great of a deal?
133k is getting up there, How many miles will you drive it a year? how long will you keep it? All things to think about. Every thing breaks, nothing runs forever.
Worse thing broken down 2k miles from home, waiting to get it fixed. You are at the mercy of a shop you don't know.
In my life experience, I have found it is often better to spend more up front for something newer and with less wear and tear, than to try and go cheap.
Most every time I have gone cheap it has ended badly. My two cents
