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In fact the 509 will out perform the 528 in many cases. 
What way is that?? Certainly not performance wise...Maybe in poor idle quality.. 
Sorry the 509 has never particularly impressed me.. 
The 509 will make more H.P. and less torque than the 528 in an engine with a real 10-10.5 comp ratio.If it's too low the .509 is a just a noise maker.The latest .509 and the .484 with the revised LC have much better street manners.
One more point about the zinc levels.They have been reduced not eliminated.800 PPM or less is about the average for regular oils.1500 PPM is the safe level.Add an additive to raise the level to the safe level or buy one of the very expensive oils that do have enough zinc.
Leave the gun.......take the Cannoli's....Mike
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