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Delvac-1 is great stuff but can be hard to locate - usually you need to find a Mobil distributor near you, and it's expensive - $20-$23 per gallon.
Amsoil 15W-40 is also great stuff if you can get that, and at "dealer" price, it's pretty reasonably (about the same as Mobil-1 though after shipping & taxes). RedLine makes fantastic oils as well but they're pretty spendy, in the $7-$10/qt range IIRC. Any of the above are worth trying before yanking lifters out. (Just remember NOT to use the cheapo SynTec, Rotella, or Delo "synthetics".)
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