1990 BMW 525i Q&A

1990 BMW 525i Question: low oil pressure light came on and engine stalled going 40 mph

car has 280k miles but the engine was changed and then about 70k the head was replaced with a rebuilt head. I have been driving back and forth to Atlantic City a lot in the last couple of months and it has been running fine, I checked my fuel efficiency and its been around 21mpg, I do have an oil leak but I monitor and add oil when necessary, any ideas what may have happened I had it towed to my house this happened last night 8-9-13 and haven't talked to a mechanic yet -
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