I used a HSBC bank machine as it was close to my hotel, and I didn't need to withdraw much - not enough to care about variables, or so I thought. Funny thing was the machine gave me a choice of 2,000 pesos, 3,000, or 7,000. I couldn't select my preferred amount, and 5,000 was not a choice.
I knew that my bank had a daily limit of just over $300 USD, and I hadn't cared enough to ask for them to change that. So, to get 5,000 pesos, I had to withdraw 3,000, then 2,000 more. I got 8,000 over two days, paid the balance on my hotel, and was fine for the week.
I'm always nervous about those, even tho they are one of the few places with English translations. I was sure that I'd told my bank that I was traveling and using in Mexico this time, but still worried I'd screw up somehow.