Dark smoke is normally excess fuel, but the gray smoke may be oil because gray and blue smoke look similar. However, it sounds a little off that you are burning this much oil and not have thick blue/gray smoke. If this smoke that you are seeing is constant and gets worse when you accelerate then that may make more sense. Here is a guide that talks about this:
https://www.2carpros.com/articles/blue-smoke-from-engines-exhaust
However, I would suggest we do a little more checking first.
Let's start with removing the oil fill cap and see if there is any smoke or pressure coming out while the engine is running. This is a clear sign of excessive blow by. That means the rings are failing and the engine will need to be replaced or rebuilt.
Next, we need to check the head gasket and make sure we don't have a greater engine issue.
https://www.2carpros.com/articles/head-gasket-blown-test
Clearly if we have any of these signs then we are going to have to most likely replace the engine. Let's start with this and go from there. Thanks
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Thursday, November 11th, 2021 AT 6:51 PM