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Down 2 Qts Oil

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Old Aug 20, 2006 | 07:38 PM
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Down 2 Qts Oil

How do!
Noticed I was down 2Qts oil about 4 months ago. Oil change 3 weeks ago and down 2 again. No leaks or drips or oil inside or out. I've used synthetic oil for last 140k of the origianl 190k. No engine repair work ever. Some loss of power on acceleration and incline. What's the first move: compression check? Someone suggested I change out the synthetic for a Havoline or Rotella oil.
5.8 351W

thanks
 
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Old Aug 21, 2006 | 05:59 PM
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I'd continue synthetic, Do a compression test, look for oil in the air box, pull a few spark plugs, look under the truck real good.
 
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Old Aug 22, 2006 | 07:45 AM
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a common problem with my 91 5.0 is oil leakage at the valve cover gaskets as they usually give out too early. It might not be making all the way down yet
 
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Old Aug 22, 2006 | 08:39 AM
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190K? I'd be surprized that it didn't use some oil, and leak a little too. The rings and valve guides should be showing their age. Run a leak down dry and then wet. Look for oil residue on the plugs. 200K is about due for a total rebuild.
 
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Old Aug 22, 2006 | 04:55 PM
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Okay- what's a leak down?
 
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Old Aug 22, 2006 | 05:21 PM
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I'd also check for a stuck PCV valve.
 
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Old Aug 22, 2006 | 05:30 PM
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Originally Posted by Dutch123
Okay- what's a leak down?
It's like a compression test, but you pressurize the cylinder and see how quickly it bleeds off the pressure or leaks down.
 
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Old Aug 22, 2006 | 06:41 PM
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Originally Posted by baddad457
I'd also check for a stuck PCV valve.
I second that, though morso on the GT-40 intakes because of it being located on the lower manifold. Could still be the culprit though.

Also, as mentioned above, do leak down test.
 
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Old Aug 23, 2006 | 05:46 AM
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You aren't really waiting until your 2 quarts low to put the oil in are you? Time to start checking your oil more regularly. If your changing oil at 3000 miles 2 quarts isn't terrible. Not great either. If your going 5-6000 miles then 2 quarts ins't bad.
 
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Old Aug 26, 2006 | 02:47 PM
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No- check the oil weekly. Diagnosed yesterday as slight leak with intake manifold gasket. This replacement job is out of my skill level. Do I want to have it done now? If I wait am I heading for trouble?? Finally- if done professionally, what am I lookingt at laborwise; 2-3 hours??
Dutch
 
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Old Aug 26, 2006 | 04:28 PM
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It's down 2 quarts everyweek? I would get if fixed asap and how could you not noticed a puddle of oil if it's throwing out 2 quarts a week?
 
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Old Aug 26, 2006 | 06:59 PM
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No- maybe down 1qt every 10 days
 
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Old Aug 27, 2006 | 06:23 AM
  #13  
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That's a little too much for me. I'd go with fixing the vacuum leak and see if they find anything else.
 
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