Q: Engine smokes on start up

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I just bought Mazda 626 1999 model to replaced the old one but quite unfortunate the engine short oil within a month and I was adviced to change the oil which I did but the engine blowing blue smoke in the morning after start-up and when raising. I decided to return the engine back where it was bought but I was told that it was wiring problems. Is it true? What should I do?
My car has a manual transmission.

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