My son"s 2008 Imprezza WRX was towed to this deale...

My son"s 2008 Imprezza WRX was towed to this dealership after it had stalled and couldn't be restarted. Took a few days to get it in to be diagnosed. Service rep. called to say that they had got it to start and it ran 20 minutes then stalled again. He said because the car had been modified, they had no idea what the readings should be but thought it could be the mass air flow sensor. I asked how much that was and he said $500 plus installation. I asked them to check the fuel pump pressure and googled the mass air flow sensor price and location of the unit while they did that. Price was around $100 and it is located right on the intake of the air cleaner. Almost every review said to get a can of sensor cleaner and clean the mass air flow sensor. Dealership called back and said the fuel pump pressure was within specs. I asked if they had cleaned the sensor and he said no, they only replace them. I asked them to terminate the work on the car. Bought a can of mass air flow sensor cleaner and drove to the dealership. Paid for the 2 hrs. of diagnostics which I didn't have a huge problem with but was also charged $40 for "shop supplies" which I did have a huge problem with! Opened the hood and removed the mass air flow sensor (2 screws and undo the electric clip) which took less than 2 minutes. Sprayed the sensor with the cleaner and let it dry. Installed the sensor and fired up the car. Has been running perfectly since then. Here's another issue: they performed a ? point check on the vehicle. Comments were the engine oil was extremely dirty, the transmission fluid and differential fluid was extremely dirty as well as a few other problems. Went straight from the dealership over to Mister Lube and changed the engine oil which had less than 5,000 kms on it (we use Amsoil synthetic). Caught a sample which looked fine. Got samples of the transmission and differential fluids which looked like new!! Extremely disappointed with the misleading information. Will not ever see them again.