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#1
11-22-2009, 07:21 PM
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oil in coolant overflow
My friend owns a 2004 Grand Prix with a 3.8 motor. He is noticing the brownish foamy kind of residue in his coolant recovery tank - which we think is probably oil. Do these motors still have intake manifold problems like the older 3.8s?
Do you think the intake gaskets is the place to start? Possible cylinder headgaskets? Possible trans cooler? I was kind of under the impression that GM may have solved the intake problem. Thanks in advance!
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2003 Pontiac Grand Prix 3.8 Litre V6 ASE Certified Master Tech 
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#2
11-27-2009, 02:21 PM
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Re: oil in coolant overflow
How old is the Dex-cool or has it ever been replaced? Still 5 years or 150K miles, whichever comes first on replacement interval.
If this is the NA SIII 3800 engine then the UIM problem should have been resolved. It is a metal UIM plenum now. I've seen anecdotal data on the NET concerning LIM gaskets on the '04 and up so it is a possibility. Dexcool sludge is still not uncommon in the coolant reservoir. BTW - How does the radiator filler neck look?
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'08 Pontiac Grand Prix GXP (Dark Slate Metallic) - LS4 5.3L V8 '02 Oldsmobile Alero GL2 - LA1 3400 V6 '99 Buick Regal LS - L36 Series II 3800 V6 '03 Honda CR250R MX - 2 Stroke 250cc '97 Pontiac Grand Prix GTP - L67 Series II 3800 V6 Supercharged (Sold) Timeslip 08/12/06 AF Community Guidelines
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#3
12-07-2009, 04:40 PM
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Re: oil in coolant overflow
Yes, the question is with the radiator filler neck. My '99 GTP started to produce more and more brown sludge up in the neck, and after a LIM gasket replacement, the filler neck is nice and clean.
The sludge also collected in the Low Coolant sensor, causing that to provide false low coolant light ON.
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-Brent '99 GTP
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