That oil turned into a nice froth!
Even if they just replaced the gaskets and changed the oil and flushed the cooling system that motors on borrowed time.
It's also very possible to hydro lock the engine if that got into the cylinders.
Last year 2 of our 3 Saturns (a 2000 SW2 with about 70k, and a 2002 SC2 with 40k) needed the intake gaskets replaced. We noticed every month we had to add coolant to them. The low coolant light would come on at several occasions.