(2nd LD) SK Innovation-Q2 earnings(2nd LD) SK Innovation swings to red in Q2 on falling oil prices(ATTN: CLARIFIES 8th para; ADDS closing share price in last para)By Kim Seung-yeon SEOUL, July 28 (Yonhap) -- SK Innovation Co. said Friday it turned to the red in the second quarter as falling oil prices and thinner margins hurt its profitability. The company logged an operating loss of 106.8 billion won (US$83.2 million) in the April-June period, compared with the 2.32 trillion-won operating profit a year ago, the energy unit of SK Group said in a regulatory filing.

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