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Hello, I'm Brandon - VW tech.
Do you have sufficient engine oil level?
Do you know what is weight of the oil they used?
If the oil level is OK. You will need to check the oil pressure at the oil pressure switch. You need to make sure how much pressure you are loosing.
It could be a bad oil pump, oil pump up or the worst case rod bearing.
Please rate me positive for the prompt service, Let me know if you have further questions.