I found this on a nissan forum:
Thanks Nick. Guess will just leave it at that level then, and check it regularly until I have a better idea how much oil my car is consuming. I thought more oil (up to the max mark) would prevent oil starvation. But in this case, it seems to cause cavitation, which reduces engine power, and turns oil into froth (adding air bubbles). So better leave it at 3/8" below max; doesn't seem to be a downside to it . Nissan should have changed the dipstick on DBA cars to reflect the top mark 3/8" below where it is now. Due to the new sump design, maybe DBA cars hold the same 5 quarts 3/8" below max, than CBAs at the max mark, no? Have a great weekend everybody
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When the engine has oil all the way to max combined with high speed corners the oil seeps up to one side entering the cylinders and being splashed around by the cranckshaft causes the oil to foam. Especially to the side in which the rotation of the cranckshaft turns it pumps it into the cylinders/keeps it away from the pump.
This is a 60 degree v6, however for the 90 degree v8 which suffer this even more Bmw had a complex system on the old v8 m5s where they had secondary electric controlled oil pumps located in the cylinderheads which where controlled by the ecu, when the car noticed long hihg speed turns these pumps scavenged the oil out of the cylinderbank on that side because the oil likes to flow up through the drain canals of the cylinderhead.
Dont forget that at operating temps oil is thin like water so it will splash and creep all over the place hence why a dry sump is preffered to reduce foaming, however the vq38dett that the gtr uses doesnt have a dry sump so extra measures need to be taken.