I think regular frequent oil changes are good enough. If you change the oil often enough, you won't need to remove all the impurities from the oil, and during the life of the oil the oil filter should handle anything that needs to be removed.

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Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record