Gotcha, I do the same. In fact I learned that on here, as the contractor that built our pole barn garage told me he dumps the used wmo from his oil changes right into his 06 PSD fuel tank and I inquired about that on here. He said he did it in his older 7.3 and had almost 200k on it and never had a problem with that truck. I asked about that on here and got a firm NO WAY! This site is awesome