Bruno Spengler said he was left "in a dream world" after taking BMW's first DTM victory for 20 years at Lausitz on Sunday.
The 28-year-old Canadian started from pole position and resisted intense race-long pressure from Gary Paffett, the Mercedes driver spending most of the 52 laps less than a second behind the Schnitzer-run machine.
Spengler, who switched from Mercedes to BMW during the winter, delivered the manufacturer's 50th DTM victory in only its second race since returning to the series after a long absence.
"It's difficult to describe. It's a crazy feeling," said Spengler. "I was the first one to do a BMW pole position since they came back. Now the 50th victory for BMW is such a special feeling.
"After I crossed the start/finish line I felt crazy. I just wanted to get out of the car and run everywhere. It was amazing and it still feels like I'm in some kind of dream."
Spengler paid tribute to his Schnitzer mechanics, who delivered two mistake-free pitstops just over 24 hours after allowing their driver to leave the track without his front-right wheel properly attached in practice.
"The guys did such an amazing job," he added. "The pitstops they [the mechanics] improved all weekend, and they were up practicing late last night. And in the race they were perfect.
"We had a lot of pressure from Gary but we still managed to be strong and made no mistakes. I'll remember that race for all the rest of my life."