I don't know the answer to your question, but I had my Golf serviced at my local indie and noticed a lot of oil under the car. I took it back and they said that the rubber seal on the oil filter holder had split.

I reckon they hadn't fitted a seal at all. If I'd gone on a long run the car would have seized and the garage wouldn't have done anything about it.

I will change the oil and filter in future, I only took it to a garage to get the cam belt and water pump changed.

You need to check your car wherever you take it, they are nearly all useless and careless.