Originally Posted By: saaber1
This is especially important in flat-tappet engines where bigger camshafts grinds and higher valve spring pressures are now popular. This additive is designed to allow pistons rings to seat properly, while allowing other engines components to avoid excessive wear.
Very important when BREAKING IN a motor of this caliber. Not the first couple thousand miles, but the initial 20 min break-in above 2k rpms, and 1st 500 mi oci. Im not claiming your motor will lockup if you don't use a break in add, but this stuff gives a little extra protection. Not so much a modern motor, but you will notice many manufacturers factory fill is specially formulated for break-in.