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I did not have one on for 25K miles on my L99. Put one on and would catch about 3-5 ounces every oil change. I put Seafoam in the gas tank at 35K miles and went from 22 on highway to 25 on highway. So it cleaned up some carbon build up on the valves that had happened in the first 25K.
My LS3 had a catch can on her since 500 miles. Would of been on there day of delivery but Mike Norris was out of town on tuning trip.
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