Milehigh, nobody is harder on their PD than me, I am a courier, the car gets idled, redlined, WOT constantly, city driving, maniac chicago city driving, etc.
My iron rates have been as low as 17ppm of iron in 10,200 miles... usually between 20-26. Last was 27ppm in 13,464 miles with 24k on the oil filter.
The secret? Mobil 1 TDT. Far superior to 507, which caused high iron for me too. 58 aint that great. Why waste your money on 11 dollar a liter oil that is designed with diesel particulate filters in mind, and not wear protection?