NHL teams should stick to certain unwritten rules.

Don’t let the Washington Capitals’ power play send a pass to Alex Ovechkin in “his office.” Maybe skip blocking Zdeno Chara‘s slapper in an exhibition game. Avoid smelling Brad Marchand‘s breath. Giving a goalie a “snow shower” is just rude.

At this point, the Edmonton Oilers might just want to institute a “Don’t let Peter Chiarelli make a trade” rule. At least not any tide-turning trades.

There are plenty of rumblings about the Oilers possibly trading Milan Lucic after his first two rough years in Edmonton, with some back-and-forth about whether Lucic requested such a trade or not. Even the biggest Oilers apologist who admit that Lucic’s contract (a signing bonus-heavy deal that includes a $6 million cap hit through 2022-23) is … bad. The problem is that any reasonable hockey person knows that. Even some of the unreasonable ones probably get that message.

With that wide notion noted, it’s unavoidable to point out the elephant in the room: is there any reason to believe that the Oilers would win a trade involving Lucic?

The Ten Percent Rule

There are serious worries that the Oilers aren’t learning lessons from their mistakes, so allow me to suggest an amended rule: Chiarelli should never trade a forward coming off of a season with less than a 10-percent shooting percentage. It would apply a magic wand to some of the franchise’s most jarring (or funny, if you’re not an Oilers fan) mistakes. Consider that:

• After generating at least a 10.4 shooting percentage for his first four seasons, Taylor Hall dipped below double digits during his last two campaigns in Edmonton. Despite icy puck luck (9.1 percent) in 2015-16, Hall still scored 26 goals and 65 points. Lucic scored six fewer goals in 2015-16 (20 in 81 games) with the Kings despite a 16.1 shooting percentage. As much as the Hall – Adam Larsson trade was about improving Edmonton’s defense, there was also the side argument that the Oilers were opening up money to sign Lucic.

Oops.

• That Jordan Eberle trade is frequently cited, and rightfully so.

Eberle consistently put up robust shooting percentages with the Oilers … except during his final season, when he scored 20 goals via 208 shots on goal (9.6 percent). The right-handed shooter rebounded to his typical form with the Islanders while Ryan Strome predictably produced middling results for Edmonton.

Part of the argument for trading Eberle was saving on the cap, but Edmonton ended up with a ton of wasted space during the disastrous 2017-18 season, only highlighting a point:

Sometimes it’s not about if you trade a player, but when.

The Oilers could have given Eberle some time to get his game (and shooting percentage) back on track, almost certainly opening the door for a better return than Strome.

Cruelly, Chiarelli could learn something from Garth Snow, the former Islanders GM who swindled him on the Eberle deal (and most dramatically, sending Edmonton Griffin Reinhart for the picks that would become Mathew Barzal and Anthony Beauvillier).

One of Snow’s last great moves was sending Travis Hamonic to the Calgary Flames for a set of futures that included Calgary’s 2018 first-round pick.

As you may recall, Hamonic was rumored to want a trade for family/personal reasons dating back to 2015, but he stuck with the Islanders longer than some expected. Snow traded Hamonic when the time was right for the Islanders, and he received a return that looked great then and now resembles a robbery.

Lucic’s stock couldn’t be much lower considering his tough start with Edmonton, particularly scoring a pathetic 10 goals on 147 SOG (6.8 shooting percentage) over a full 2017-18 season. Before that, Lucic consistently shot at a rate that was about as efficient as Eberle’s before he was traded. Lucic scored between 18-24 goals during the four seasons from 2013-14 to 2016-17, never seeing his shooting percentage dip below 12.8 percent for a full campaign.

So, the Oilers could experience the worst of both worlds if they trade Lucic this summer. After buying high after he rode high percentages, they might trade him when his value is at its absolute lowest.

Now, it’s fair to remark that the Oilers should at least poke around to try to get rid of an absolutely horrid contract. They might just find someone to dupe.

(Hey, the Toronto Maple Leafs are probably still snickering about the trade that netted them useful assets for Dion Phaneuf, and they somehow managed to do it without retaining salary.)

Don’t sell low, again

If the only way to move Lucic is to take on a different mistake (see: the exchange of problems that was the trade that got Phaneuf out of Ottawa), then the Oilers owe it to themselves to mitigate the damage. Whether it comes down to pairing him with Connor McDavid, lining him up with Leon Draisaitl, or trying to find advantageous matchups lower in the lineup, Edmonton can pump up Lucic’s value.

The Athletic’s Tyler Dellow provided some interesting insight (sub required) on how the Oilers might be misusing Lucic, for one thing, but Edmonton may just enjoy better results from Lucic getting more bounces in 2018-19.

An NHL GM can make his team marinate in a mistake by “doubling down,” such as exasperating a bad trade with a foolish contract extension. That said, an executive can also blunder by flipping from that stubborn script: you can overreact to a mistake. Such a risk gets scarier if the organization diagnoses the symptoms, but not the cause for disorders of the roster.

When in doubt, the Oilers must ask a painful question: “Do we really expect Chia to get it right this time?”

James O’Brien is a writer for Pro Hockey Talk on NBC Sports. Drop him a line at phtblog@nbcsports.com or follow him on Twitter @cyclelikesedins.