it seem like we mostly agree that among the conventional oils, our favorites seem to be chevron, pennzoil, and castrol gtx bringing up the rear. i'm talking about the 5-30, 10-30 variety here, not the hdmo's. if you had to choose between the chevron and the pennzoil, which one would you pick? keep in mind that while the pennzoil is typically more expensive, it's also easier to find. it seems like walmart is phasing out the chevron. that leaves service stations, which in that case, raises the chevrons price to more than the pennzoil. thanks, penzdude