I dont think the 06 come with SL model. If it is replaced before, i think the engine was blown before the warranty was over. Good thing is the motor is replaced. Bad thing is , you dont know when was it replaced. Nissan wouldnt do any I4 to V6 conversion, they dont wanna deal with any problem like that and it is not worth it. Just open your hood and you will see is a I4 looking at you or V6 staring at you, like Mike said.
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