Season 7, Episode 21: "The Bottle Deposit"

-Thanks for coming in, Jerry. -Sure.

I think I know what's going on here, and I just want to hear it from you.

But I want you to be straight with me.

Don't lie to me, Jerry.

You know that motor oil you're putting in there?

It's from those quicky-lube places, isn't it?

-Well, I change it so often. I mean-- -Motor oil is the lifeblood of a car.

You put in a low-grade oil, you can damage vital engine parts.

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