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No you dont need to constantly add oil. Most of the time I have only heard of guys using about a quart every 3-4K. Which means if you just add a little about half way through your oil change your good to go.
The Piston slap isnt really a problem, its just a noise. It in aBSOLUTLY no way effects the performance of the engine. You might get a car that does it or you might not. MY 00 Z28 had 68K on the clock when I sold her and she never did it. Now my dads 02 2500 HD pickup has done it since it was brand new with 0 miles on it. Not something that you even really need to be concerned with. It actually only does it on cold starts.
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