Audi slipping in gear

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Sorry about that, I should have went into detail more.

It’s a automatic

And the problem is while im driving in. Let’s just say 3rd gear, it feel good until I give it more gas, once I give it gas it will almost feel like the gears arnt fully gripping. (Basically acceleration)

And it’s always needing oil. Atleast that’s what the car tells me.