my car? I have a 2008 ford focus that was running with no problems. I had an oil change this afternoon around 3 PM. It was fine when I drove it home. However, later tonight the car started shaking and the "service engine soon" light came on. Did they screw something up when they did the oil change? Is it safe to drive the car back and have them check it out? Or this is something completely unrelated and it was just a coincidence that it happened they day of the oil change. Please help! Thanks.