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Oil or grey milky look inside of radiator cap?

Tiny
JUGGALO45
  • MEMBER
  • 2006 PONTIAC GRAND PRIX
  • 6 CYL
  • AUTOMATIC
  • 180,000 MILES
That's about it. The car listed above is a GT model with 3800 series 3 engine. Greyish oil like look in radiator and a little knocking coming from I think the water pump.
Tuesday, January 24th, 2023 AT 7:07 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,884 POSTS
The knocking is probably the balance shaft inside the engine. Here is an exploded view so you can see what I mean. Also, does this engine have an oil cooler and is the engine supercharged? Also check the engine oil to see if there is coolant? There might be a crack in the block that is allowing engine oil to leak into the coolant.
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Thursday, January 26th, 2023 AT 11:24 AM

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