I am picky about dirt around the oil fill, funnel, and so on. I don’t think shops are that much, it’s not their own car. The last time I used an oil change place I just had a feeling and stopped right away to look under the hood. The dip stick was on top of the engine. This was wife’s car at the time, and the stick could easily have fallen into the fan etc. They tried to heavily up sell me on extras and I refused. I could visibly see the tech was annoyed , and just a few mins later the car was “ready.” The GM dealer seemed to do a good job, but none of them are as picky as I am about the whole process.