Posted by jdemaris on September 02, 2010 at 06:12:28 from (67.142.130.39):
In Reply to: excessive oil use in 6.5 posted by Martin Caldwell on September 01, 2010 at 18:36:19:
I can't say for sure what your problem is . . . but it's pretty easy to pull the pressure-hose off the turbo and check it. Look for too much side-play, signs of scrubbing, etc.
Yes, 6.2s and 6.5s will blow out oil like crazy if the crankcase-venting system stops working. I wish they just used to old pre-emissions draft-tube like a farm tractor.
Not long ago, my turbo 6.2 starting blowing oil all over the road. Never used any oil to speak of previously. Then, all-of-a-sudden, I lost 4 quarts in 50 miles. Guess what the problem was? Oil filler cap up to had fallen off and stop the crankcase vent system from working. I was at least 50 miles from the nearest parts store and they did NOT have the cap in stock. So, I cut out a chunk of my rubber floor mat and used a hose clamp to seal off the oil filler tube. Then drove 300 miles and didn't use a drop of oil. Later a $2 cap from NAPA fixed the problem correctly.
Note that the same thing happened to a friend of mine, in his 95 Dodge-Cummins truck. He was on a trip down south and oil started blowing out his rear main-seal. The repair shop said they'd have to pull the engine apart and he'd be delayed a week. He couldn't wait, so he bought two 5 gallon pails of oil and kept driving. Later, after it got even worse, another shop fixed it in 10 minutues with NO parts. It was a crankcase-vent problem.
Your engine uses a CDR , i.e. a crankcase depression regulator. Believe it or not, General Motors recommends that you replace both the oil filler cap AND the CDR valve every 30,000 miles. If I had done that, my old cap would not have fallen of and caused my problem. Gasket dried out, cap fit loose, and fell off on a bumpy road.
GM test for your vent system is this. Attach a water-manometer or equiv. to your dipstick tube. At engine idle, it should read no more then one inch. At 2000 RPM, 4 inches max.
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