Casandra (@casandraa.oo) shared the timeline of what she says happened after taking her graduation-gift Porsche Cayenne in for an oil change at what she described as a large instant oil change chain in Tennessee, likely Valvoline. When she contacted the oil change shop, she says employees told her they didn’t know how to reset the warning. Casandra says she called the oil change shop as soon as the “oil pressure low” warning appeared. But her experience underscores how quickly a routine oil change can turn into a much bigger problem. One commenter said something similar happened to her mother after a dealership oil change.