Personally, I use Mann/Bosch/Puro filters all the time, including QS, ProLines, Classics, Motorcraft, P1s, Bosch Premiums, and D+s-I'm just a little concerned over their recent lackadaisical approach to customer service. Things like a blanket 3,000 mile recommendation for ALL filters, including the premium priced filters, and total disregard for any problems. Not what I'm looking to use to protect a $10 grand engine!