Problem: Intermittently my Nissan Maxima 2002, with 90K will consume a large amount of oil.
<br/> Latest episode 1.5 quarts down after 500 highway miles. Previous 500 highway miles no oil consumption at all. This occurs periodically.
<br/> No physical oil leaks.
<br/> No oil in coolant.
<br/> No eivdence of oil burning on tail pipe.
<br/> No evidence of oil spray on tail pipe.
<br/> Compession check, normal.
<br/> Dealer has no idea of what the problem is. He suggests two options: replace pcv valve for $150 and/or/ replace valve covers and pcv valve baffle for $1,000. He admits however, that these could be shots in the dark and he cannot guarantee that either action will solve the problem.
<br/> Any ideas out there?