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How do I locate a leak that lets antifreeze and oil mix inside the oil pan?

When I try to fill the radiator with antifreeze, the antifreeze level always stays low and somehow it leaks into my oil pan and mixs with the oil. The way I discovered this problem is, I was driving and had a large white cloud of smoke coming from the exhaust pipe and found antifreeze leaking from exhaust pipe and boiling into a white smoke. I pulled the intake thinking that it was the intake gaskets, but the LT-1 does not have antifreeze ports like a typical 350 sbc, so obvious it is not leaking from the intake gaskets. Where could this leak be occuring? Any help would greatly be appreciated tremendously! Thanks in advance!

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Most likely a head gasket. The coolant is forced into the oil chambers and mixes. This too leaks into the exhaust gases and burns off as you describe. You usually get oil in the coolant reservoir. This can be checked with a test strip available at automotive supply store. It measures the acidity in the coolant.

Posted on Feb 21, 2012


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Posted on Jan 02, 2017

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SOURCE: leaking antifreeze

A quick check you can do to help your troubleshooting is to remove the radiator cap then start the vehicle. (Ensure radiator filled so you can see fluid level). Watch the fluid inside the radiator. Initially after you start the vehicle you will get some small air bubbles but they should go away in less then a minute. If after a couple minutes you have bubbles continually coming up or it starts bubbling out of radiator then you can bet on the Head gasket. If you do not get the bubbles it dosen't rule out either one but if they are there as described then you can look at the head gasket.

Posted on Aug 16, 2008

  • 130 Answers

SOURCE: oil is mixing with antifreeze. landrover

Sorry to be the one to tell you but you have a major expense on your hands. It is either a blown head gasket (the cheapest solution) or a cracked head (the next most expensive solution) or a cracked block (don't ask! ). Take it to a shop and have them do a compression test to find out which cylinder is leaking. Then get at least three quotes on repairing the damage. Good luck!!

Posted on Apr 19, 2010

Testimonial: "thanks for advice. head gasket went a few months ago.they charged me £650 to repair it"

  • 55 Answers

SOURCE: 1993 camaro V6 3.4 lt water and oil mixing could it be water pump

Yes there is another way, someone can be messing with your head and pouring water in your oil cap. Do have water in your oil or oil in your water or both? A product called sea foam does a miraculous job at getting water out of oil. As far as keeping it from happening further, the cheap way of course is "bar's stop leak" but man can this stuff do a number on clogging your heater core, even if they say it doesn't, it can happen.

Posted on Jun 07, 2010

  • 749 Answers


Ethylene glycol green type mixed as 50/50 ratio.Many brands would be safe to use in your vehicle such Prestone,Texaco but as the article below states Ford perfers you purchase their brand of antifreeze and that you should not use propylene glycol. Please click the link for more information.
Here is a Ford technical service bulletin on this at this link.It is PDF file.

Posted on Nov 13, 2010

  • 813 Answers

SOURCE: What type of antifreeze to use?

Go to Napa and buy the antifreeze your car came with Zerex G5

Posted on Oct 27, 2011

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Don't worry bad spelling is OK, Pending on the year make & model (they basically all work the same) Have the cooling system pressure tested for holding PSI. Do you see any white smoke at the exhaust pipe? white spark plugs? Any oil or anti freeze mixing in the radiator or the oil? Dripping from the tailpipe? any of the above, HEAD Gasket, cylinder head, or Intake manifold gasket. We have a Rotten egg smell w/ the heater fan on, wet pass. floorboard? If so then the heater core might be leaking. If the floorboard isn't saturated w/ AF it could be leaking into the firewall. Start w/ the basics, fill rad & overflow to spec., pressure check, ck plugs emissions test, oil coolant mixing. It's rough sometimes but it's going somewhere! Good luck, Frank M

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