2002 GMC Sierra Oil

Tiny
WEAVERBAMA
  • MEMBER
  • 2002 GMC SIERRA
  • V8
  • 4WD
  • AUTOMATIC
  • 166,000 MILES
Forgive my ignorance on this, having trouble with my maintenance. All of a sudden, the oil in my oilpan is "milky" or rather like cottage cheese. I have no idea what causes this and would like to have a little "intelligence" before I have to deal with someone to fix this. I have a Z71 GMC '02 with 166,000 miles. The truck runs absolutely perfect other than I have lost mileage on a full tank, roughly about 50 miles per full tank(used to get 400 miles on a fulltank, now 350 or less) No loss of power or anything. Can someone offer me any suggestions as to what might cause this?
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Tuesday, December 16th, 2008 AT 7:08 PM

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Tiny
BUDDYCRAIGG
  • EXPERT
DO NOT START THE ENGINE UNTIL THIS IS SOLVED.

You may have already ruined your engine.
You said this.
The oil in my oilpan is "milky" or rather like cottage cheese.

That is a bad sign that the coolant has leaked into the oil somewhere. Possibly an intake manifold gasket or head gasket.

Beg, borrow or steal a coolant system pressure tester.
If it leaks down but you dont get any coolant on the ground, then the coolant is going into the engine.

And get 5 gallons of diesel fuel.
Drain the oil,
put on new filter and reinstall drain plug.
And stuff something in the oil dipstick to seal it.

Now pour in the diesel fuel in the oil fill hole until the engine is full
and I mean all the way up to the oil fill hole.

REMOVE THE SPARK PLUGS
and unplug the power wires to the coil so it can not make a spark.

Now use the starter to turn the engine over for about 60 seconds.

Drain diesel fuel
replace filter
and fill to normal levels with cheap oil

use the starter and crank the engine for 60 seconds.

Wait 10 minutes for that oil to drain into the pan
and do one more oil change.

Put spark plugs back in.
And start engine.

Valve lifter noise will be normal for a while.

Cross your fingers that you have not had any bearing damage.
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Tuesday, December 16th, 2008 AT 7:49 PM

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