Known issue to Buick Enclave. GM extended warranty up to 2009 model, but never fixed the engine. If it covered later years, extended warranty would cover me a few years ago, but not now regardless. This pretty much totals the car. No rattling so far, just check engine light and maybe loss of power. Don't know if it is worth fixing or drive it until it blows up.

Check engine light came on while trying to start the car. It took a while to get it started, but once I did, the light disappeared. It later came on while driving and I took it into the dealership. They ran a diagnostic on it and said it is likely to be bad fuel. They told me to drive it until it runs out, and then refuel it with 87 grade. They said to bring it back in if I am getting additional problems.