TOKYO, Jan 14 (Reuters) - S&P Global Ratings revised

Nissan Motor's ( NSANF ) credit outlook to negative from stable

and affirmed its BB+ rating, as it expected it would take the

Japanese automaker longer to improve its business performance.

"The negative outlook reflects our view that the company's

creditworthiness will continue to deteriorate if profitability

does not improve and positive free cash flow is not secured,"

S&P said in a statement.

Nissan ( NSANF ) has increased sales incentives in a bid to correct

high inventory levels, which have risen due to a slowdown in car

sales in North America, the company's main market, S&P said.