(S (S (BASENP (DT The) (NN fuel) (CC /) (NN oil) (NN heat) (NN exchanger)) (VP (VBZ is) (NP (BASENP (DT a) (JJ dual) (NN purpose) (NN part)) (VP (VBN designed) (S (VP (TO to) (VP (ADVP (RB simultaneously)) (VP (VP (VB melt) (BASENP (NN fuel) (NN ice))) (CC and) (VP (VP (VB cool) (PRT (RP down))) (BASENP (NN engine) (NN oil))))))))))) (PERIOD .))