before the fourth hour's end, jordan taylor's right-rear tire burst on the banking entering turn 12. damage was minimal since he was near the pit lane and repairs took 29 seconds. light rain began falling just as the fifth hour began and several cars in all categories were caught out by the change of conditions. soon after, the rain intensified enough for most of the field to make pit stops for rain tyres. marcel fässler stayed on the circuit but was ten seconds slower than teammate magnussen and was overtaken by bourdais and scott dixon's fords. the rain later tapered off, but the disparity of drying of the banking and the infield sections was problematic for rain tyre equipped cars. the first major incident in gtlm came 4 hours and 42 minutes in when bill auberlen's no. 25 bmw m8's right-front tyre was cut from debris on the banking leaving turn six. he stayed off the wall and returned to his garage to repair front-right bodywork damage. pilet remained on dry tyres and took the gtlm lead but dropped to fourth by the end of hour six. in the meantime, fittipaldi lost the overall lead to castroneves before conway took it after he made a pit stop two laps later than both drivers.