SAAB what engines do they use? I heard Ford,Fiat and Gm?

SAAB what engines do they use? I heard Ford,Fiat and Gm?
Added (1). Also with Volvo if its D3,4or 5 its made by Volvo how do you know what SAAB engines are made by SAAB as I want to buy one but dont know which are SAAB and which are not a SAAB engine?

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