SAFETY-KLEEN <SK> TO BUY STAKE IN OIL REFINER Safety-Kleen Corp said it has tentatively agreed to buy an 80 pct stake in Breslube Enterprises of Toronto for 14 mln dlrs in stock, cash and equipment. Price includes 14 mln dlrs of Safety-Kleen common stock, cash and a rerefining plant owned by Safety-Kleen. Closing of the deal is expected by May. Breslube is a leading rerefiner of used lubricating oils in North America, collecting used oils from auto garages, car dealers and other businesses. In 1986 it refined 20 mln gallons of used oil.