My last vehicle, a 1998 Escort w/4 cyl, had a piston break apart while driving. It had 180k and I generally stuck to an OCI of 3k with 60/40 hwy. I wasn't pushing it when it broke apart. What would cause this? Simply age? Poor maintenance previously? As an aside, I spent $1100 to rebuild the engine and it lasted another 16k before getting totaled by someone running a red.