EDMONTON — The mystery around the Edmonton Oilers — a team having a meh season inside a decidedly average Pacific Division — is that they’ve done it before.

No matter what they’ve looked like this season, the Oilers have been a very good team for a long time now. Good enough to win the West in back-to-back seasons, experienced enough to be ready when the playoff puck drops — assuming they can lock down a ticket to the dance.

But there’s no flipping a switch on April 19. There is a runway of a month, and with four pretty good outings in their past five games (3-1-1) — including Sunday’s 3-1 win over Nashville — you might be able to see the formation of a game that can win, if rolled out night after night after night this spring.

“We’re at a point in the season where we don’t have a choice,” said Zach Hyman, who could have had three or four goals Sunday, but settled for the empty-netter instead. “We have to play well. We have to win games. We have to close games out. We have to play strong defensively.

“We did all those things — it was a good team effort from our goalie all the way out.”

The bad news: Leon Draisaitl left the game at the end of the first period, came back and tried out his undisclosed injury, then left for the night. Head coach Kris Knoblauch had this to say about his 35-goal man:

“He didn’t feel right, he went off,” said Knoblauch, describing the sequence of events around Draisaitl’s eventual departure. “He got checked out, felt like he could play on it, and the medical staff looked at him. They were comfortable with him trying it out, (but) he went out and he just didn’t feel quite right.

“The fact the medical staff said, ‘It doesn’t seem too bad and there’s no immediate red flags,’ tells me that it shouldn’t be a really long injury. There might be some time off, but we’ll find out later.”

The good news: Ozzy Weisblatt, whose hard, clean check injured Draisaitl, was a target from that point on Sunday. In a league where people notice, the Oilers made sure they answered the bell — including a crushing check by Jake Walman on Weisblatt in Period 2.

“I think you saw an emotional response, which is really good,” Hyman said. “Guys sticking up for Leo, one of the best players in the world. If guys want to take runs at him, there’s going to be a response.

“Then, you want to win the game for him.”

The even better news: Connor Ingram may just be the answer to a goaltending position that haunted this team.

Ingram, anointed as Edmonton’s undisputed No. 1 after the morning skate Sunday, gave his team a high-quality start in a game that went down to the wire before Hyman’s ENG with 67 seconds to play.

“Having your coach behind you is huge,” Ingram said after his 26-save night, “but at the end of the day my job never changes. I’m going to come in and be the same person I’ve been for the last three or four months. It’s exciting for me but at the end of the day, like I’ve said a thousand times, it’s just stopping pucks.

“It’s the same thing every day.”

The Oilers take a strategy as simple as that, all day every day.

With the travails of Tristan Jarry having been well chronicled, wouldn’t it be something if the answer came in the form of the former Arizona Coyote, who came out of the Players Assistance Program, was denied an invitation to Utah’s training camp, then was dealt to Edmonton with the label “PROJECT” stamped on his forehead like the band-aid he’s still wearing after that collision with Nathan MacKinnon last week.

But the best news on Sunday was this: two days after the Oilers had blown a 2-0, third-period lead to drop a 3-2 OT decision in St. Louis, they closed the deal in a very similar circumstance back home.

“You want to put yourself in positions like these — position to close out a game. Because these are the positions you’re going to be in in the playoffs,” Hyman said. “We know that this is how you’ve got to play, 2-1 games, 2-0 games. Those are must-win games. You can’t afford to blow leads like we did last time.”