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engine on 2008 Volkswagen Passat

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
beeping sound like if your seatbelt was off, message across panel saying oil pressure engine shut down. had it towed in to a mechanic he said my motor was blown cause the oil was real black due to lack of oil change. it starts up but do not turn over.
(1) Answer
There is a sensor that will shut down engine if you have low oil pressure. But you don't need a new engine just because the oil is black. Not changing your oil regularly is very bad for the engine. But if your engine is turning over, not knocking, or has bearing noise. He needs to do a compression test, oil pressure test, at a minimum before he can make that diagnosis. You need to get a second opinion, Turbo problems can cause oil pressure troubles too.