Corey Potter was sent to the box at the 7:06 mark of the second, giving the Oilers their second power play of the game. Right off the bat on the penalty kill, Ryan Jones created a turnover and skated down the ice. He successfully deked out Koskinen but on the backhand attempt, he just hit the side of the net.
But then seconds later, the Oilers took the play back up ice and converted to regain the lead. Milan Lucic redirected a feed from Connor McDavid past Weitzmann, completing a give-and-go, to put Edmonton back in the lead.
After two, shots on goal were 26-11 for the Oilers.
Cologne tied the game up five minutes into the third as Moritz Muller picked up a rebound in front and fired it through a crowd past Koskinen but 20 seconds later, the Oilers got that one back.
Ty Rattie redirected a pass from Darnell Nurse that went off the skate of a Cologne player in front of the net to put the Oilers back in front 3-2.
Zack Kassian was sent to the box for hooking, giving Cologne a chance to tie the game with just over eight minutes to play. Shots on goal were 32-13 for the Oilers at this point.
Less than a minute into the man advantage, Ben Hanowski picked up a rebound in front and ripped it by Koskinen to knot the game up at 3-3. Former Oiler Ryan Jones got one of the assists on the play.
Cologne head coach Peter Draisaitl was pleased with his team's overall performance.
"For us it was a very important game. We played two pretty good hockey teams lately, in Munich and today against the Oilers. It was nice to see our team competent in both and hopefully we can use it moving forward as a confidence boost for us," the elder Draisaitl said.
"There was some important situations for our team. We scored a power play goals -- we were struggling lately -- we created chances and were struggling to score goals."
Leon's dad then said that he felt having to go against his son wasn't quite as difficult as he imagined it would be.
"It was easier than I thought. Not a big issue at all. The Oilers, for whatever reason, are my favourite team in the National Hockey League. I wish them a great season."