Nope! Over 10 years running my high power built motor 350z still doesn't have one. My 370z doesn't. Most of the customer Zs I built never got one either. What looks like a lot of oil when pooled up in a can, would have been a minuscule contamination to the hundred of thousands of times as much air that traveled through the engine in that same time.
I had all my charge pipes off 2 weeks ago when I did my solid motor mounts... There was hardly even a film.. So I still have a lot more mileage to go before I'm worried about the intercooler losing efficiency.
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