I have just obtained a 1997 Chrysler LHS. The 3.5L V6 has minor oil leaks, not enough to have to add oil, but enough to spot the driveway (wife ain't happy with this!). I prefer PP 10-30, but should I try a HM oil? Or would the PP 10-30 exacerbate the leaking? Also, is there a synthetic HM oil available? FWIT, the engine has 100K, and I drive 100% on Interstate highway. Opinions welcome, thanks.