Grades, takeaways from the Oilers’ Game 4 win — and the big question for Game 5

The Edmonton Oilers faced a 2-1 series deficit heading into Game 4, and after two Dallas Stars goals in the first 5:29 of the game, it looked like that could grow to 3-1.

Then the tide turned, significantly.

Ryan McLeod and Evan Bouchard scored in the first, followed by goals from Mattias Janmark and Leon Draisaitl in the second — and an empty-net…