Winkelhock posted a new lap record on his way to his debut win in the series.
Jeff Allam, in his Vauxhall Cavalier, chased Winkelhock hard throughout, but in the later stages the Briton had to defend his second place from the hard-charging BMW team leader, Steve Soper.
Soper, Allam's compatriot, finished third less than half a second adrift of Allam to retain his championship lead. Soper, with 72 points, leads Winkelhock by 22.
Patrick Watts brought the Mazda Xedos 6 home in fourth spot to record the team's best finish yet. BMW dominate the manufacturers' standings.
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