(Spoiler: It’s just your oil cap upside-down.)

If someone asked you to check your 710 cap, congratulations. You’re either being pranked, tested, or finally inducted into the fine tradition of automotive confusion. Before you start looking for parts diagrams or filing a warranty claim, let’s answer the question.

A 710 cap is not a special part. It’s not a racing component, a pressure valve, or a calibration port for turbo alignment (though that sounds impressive). It is, quite literally, the word “OIL” rotated 180 degrees. Some people call it a 710 oil cap, but we feel that ruins the joke.

It’s your oil cap, viewed by someone who either:

1. Has never rotated an object before
2. Wants to confuse someone else
3. Is working a little too hard to seem helpful

So no, it’s not “710” like a model number. It’s “OIL.” But more like a meme.

Because this is how car people entertain themselves.

The 710 cap meme is old. Like, older-than-carburetors old. And yet, it still works, because it’s dumb in the best way. It’s the dad joke of car pranks. It’s the rite of passage. It’s the moment someone learns that even engine bays have a sense of humor.

You’ll most commonly encounter it:

On forums where everyone uses screen names like “MustangDaddy47”
At junkyards
In shop classes

Yes. That would be us. At KaleCoAuto, we proudly offer a 710 Cap for all your upside-down oil containment needs. It is just as functional as a regular oil cap, but far more confusing. Which is exactly the point.

You can’t actually buy one. Just look at your oil cap upside down for free.

But hey, why don’t you check out our entire catalog of unreal parts?