How many additional quarts of oil do you need?, External oil cooler question. Options

[Craigers17]

So this is probably a stupid question, but I'm assuming that if you choose to run an external oil cooler, you have to add at least another quart of oil due to the additional volume in the lines and cooler coils.

I'm also guessing that the additional volume varies depending upon the cooler location. So if a stock 2.0 - 4 takes roughly 3.5-4 quarts, how much additional oil is required? Let's assume a rear mounted unit.

Or...is it as simple as fill up the cooler and lines, install, and then fill as normal until it matches the dipstick fill line?

Any advice/ridicule is welcome. Thanks.

[Craigers17]

Thanks for everyone's input....very interesting. I would have never thought that on big sixes with front coolers, it would take up to 16 quarts. I bought a car that should be in my possession soon, and I'm thinking about relocating the cooler from it's current position up front back to the rear. If I do relocate, I would be going to a smaller cooler with a fan, which was one reason for the question.

There are a few reasons for the relocation, but I want to see it in person before I get to deep in the details. Thanks and I'll post pics when I get the car.
(IMG:style_emoticons/default/beerchug.gif)