Chevy/GMC 6.2L and 6.5L Discussion of Chevy and GMC Trucks with 6.2L and 6.5L Diesel Engines

6.5 oil leak

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Old Aug 7, 2009 | 04:24 PM
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rednekroper05's Avatar
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Default 6.5 oil leak

I have a 94 that was leakin oil bad 1gal in 140miles. All i know is it was leaking on to the manfold. i had replaced the passenger side head gasket about 3 months prior.

My question is does this just sound like a head gasket failure?
 
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Old Aug 8, 2009 | 01:46 PM
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If you have oil coming out your head gasket something is majorly wrong. Which side of the engine is it leaking on? Could be oil cooler lines...
 
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Old Aug 8, 2009 | 06:14 PM
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it is leaking on the drivers side. im not sure were the oil is coming from just know it was leaking on to the driver's side exahust manafold.
 
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Old Aug 9, 2009 | 05:35 PM
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not a head gasket. im thinking you have rotted out oil cooler lines or the connectors broke. it also could be the oil pan gasket. but probably no t that much oil. it could be a combo of the two
 
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Old Aug 9, 2009 | 11:54 PM
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Never really messed with that 6.5 that much but where is the oil cooler lines at?
 
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Old Aug 9, 2009 | 11:57 PM
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they run from the tranny to in front of the radiator. they got a hard plastic sleeve on them that you can move a few inches.
 
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Old Aug 10, 2009 | 12:37 AM
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not sure but i didnt think the manuals had a oil cooler. Am i wrong on this?
 
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Old Aug 10, 2009 | 12:48 AM
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is it 4x4? if so the orings in the 90 degree oil filter adapter are probably leaking, a very common issue with the 6.5
 
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Old Aug 10, 2009 | 12:51 AM
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no its 94 2wd 3500 w/5speed
 
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Old Aug 10, 2009 | 06:55 AM
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Gotta be the cooler lines, when replacing them dont get a stock setup again, they will fail quickly, get a set of braided ss lines...
 
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