rtokens: Buying interest in crude did not have enough conviction to send it much higher since many players had left early to start the Labor Day holiday weekend , traders said .
pos: NNP NN VBD CD NNS JJR IN $ CD NN .
tokens: October crude stood eight cents higher at $ 22.23 barrel .
ltokens: The October heating oil-to-crude crack spread narrowed to $ 4.22 a barrel from Thursday 's $ 4.58 while the October gasoline-to-crude spread narrowed to $ 3.60 from Thursday 's $ 3.86 a barrel .