on a E28 BMW M525i is the round thing that bolts intothe bottom of the...

LewisAtherton

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...sump the oil pressure sender? i have posted this question for my step dad he has bought the car recently and he has found a problem he is wonder is the round thing that bolts into the bottom of the sump the oil pressure sender
 
No that's the sump plug used to drain the oil, the oil sender will be on the engine block.
 
That is the oil level sensor
The oil pressure sensor is beside/near the oil filter assembly.
 
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