BUZZ-Penn West Petroleum Ltd: Set for best day in 6 years
** Canadian oil producer's U.S.-listed shares up 9 pct at $7.65 premarket; set for best day since November 2008
** Posts Q2 profit of 29 Canadian cents per share, compared to a loss of 11 Canadian cents a year earlier
** Says on Thursday strengthening its accounting practices
** Toronto-listed stock down about 10 pct since the company uncovered accounting irregularities in July
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