i have a 91 civic ef with a single cam vtec...bought it 3 days ago drove fine all the fluids were fine...was driving in nd the car started bogging out in 3rd gear put it in neutral kept drivin then the oil light came on nd it died took it to a mechanic nd he said the engine was seized does anyone know what the problem might be?or how to unseize it?

 

Sounds like it ran out of oil, due to a leak or burning it and not replacing it. That causes severe damage inside the engine. Most people find it simplest and cheapest to replace the complete engine with a used one.