im not to sure about v6 engines... so with that said is there and difference between the buick 4.1 and oldsmobile 3.8? are they the same engine? parts interchangable. the reason i ask my regal has a 4.1 i think it needs to be replaced and my cousin has a cutlass with a brand new 3.8 in it zero miles hasnt been started yet im thinking about buying it.