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2005 GMC Sierra 1500 4x4 L33 5.3 with 208k miles.
I did some research, and found that my oil pickup tube o-ring is most likely causing my oil pressure 'issues'
The 'issue' is that in the morning during the first start up of the day, the oil pressure registers low enough to trigger the low oil pressure warning. At idle in PARK it will usually stabilize (when cold) between 5 and 20 psi, but it will drop below that when idling in DRIVE as well, during the first few minutes of operation.
Asthe engine warms up, the oil pressure increases, and generally driving down the road when cold it reads 20 psi, when warm its 30-35 psi.
Like I said, I believe the culprit is the pickup tube o-ring.
My question is, what is involved in dropping the oil pan to replace this $5 part? Do I HAVE to remove the front diff and everything associated with it?Edited by jmpidgeo
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