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The piston rings might be ok, but you need a vcm muzzle.
There's 2 types, one that goes on a sensor that you can take off if you need to take it to the shop, and one you hard install.
Whenever it says it's in eco mode, the vcm has kicked in and turns off some cylinders. Except it doesn't do it right, and there's a pressure buildup sometimes, which barely stretches the piston rings, causing oil to leak in just a tiny bit.
The more often you pop in and out of eco mode, the faster it wears out.
We had the same issue, and got a muzzle for the vcm, and replaced all the spark plugs.
Well, we tried replacing the one that was oily and charred with a cheap one, and it failed 1 months later, oily and charred again.
So we installed the muzzle, and replaced all the spark plugs with high quality ones, and 3 months later it's running smoother than it ever did.