I am puzzled... I have a 87 5KQ with 166K miles. I have to add oil often (2 quarts last night). It runs fine, no oil on plugs, no blow by that I can detect. Gas milage is about 21mpg in town. No leaks, I replaced the value cover gasket. The only thing I noticed was that when I changed out the air filter that is was wet with oil. Can any one give my help??? Could it be the PCV?? Thanks, Bob