I took my car in for a service and mot, mileage 17454 on 18th July 2018, after checking with universal all works complete, they rang me back after a few minutes saying they had notice that there was a screw in my rear tyre and it needed replacing, I gave them the go ahead, and allowed a further 30mins for the to change the tyre on attending the Plaistow centre my car was ready but the MOT was not I had to return after an hour to collect it. Today July 21st my car warning light came on requesting that the oil needed to be changed, the mileage at this time was 17478, I checked the engine oil and it was found to be thick and very black unlike new oil that should be l light and viscus, I checked universal FAQ's for servicing and both major and interim services state "drain oil" what does this mean? is the dirty oil put back in the engine?!, As of Monday Next I will be contacting Universal for an explanation regarding the above