Its in my wifes odyssey. I have religiuosly changed oil every 4k miles since owning. This thing has had ALL sorts of 5w 30 in it(mixes,ST,synthetic,PYB,Valvoline,QS,castrol,and whatever wal-mart puts in)It now has 175k and the valvetrain looks like brand new.I have run a 1/3 can seafoam in the...