Question about 1993 Chevrolet K1500

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Oil in the antifreze over flow tank

We think we have oil in the anit freeze overflow tank is it the head gasket or is it a mix of different antifreezes
engine not runnung smoothly when idling, when I step on the gas to accelerate the engine misses a bit, there looks to be a lot of leaked oil under hood under belts, oil in antifreeze overflow tank, there's kind of a squealing noise in engine when accelerating.

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  • Bruce Bracey
    Bruce Bracey May 11, 2010

    If there is oil in the anti-freeze, check the engine oil and transmission oil to see if it is "milky". Also a head gasket issue will tend to blow bubbles in the anti-freeze tank with the cap remove. Please DO NOT remove the cap when the engine is hot, only cold ( safty first ). Start the engine and watch for several minutes and see if it starts a contstant stream of bubbles.

    Let me know.

    Regards,

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Yes, oil in the antifreeze typically comes from a blown head gasket. To verify, start the truck and watch the overflow tank you should see what looks like a back flow or bubbles. By the time the truck get to normal temp, it'll be obvious.

Posted on Feb 23, 2009

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Oil in the antifreze over flow tank


hi there is there alot of oil in the plastic overflow tank ? what color is it ? when did you notice it ? does the engine run good is it shakey ? take a peek at all ur spark plugs you want them all to look the same slight brownish color is normal. lots of white on the plugs means coolant is getting on them under heat and pressure they get clean too white this is usually a head gasket damaged and leaking a little coolant into cylinder burning and being exausted through the muffler and you might see a white smoke from tail pipe, saying that coolant would not be going in oil that way . if its automatic trans there is a transmisson oil cooler built into the rad now tranny fluid runs through the rad cooling transmission oil coild get from transmission into rad in turn, getting into plastic over flow container. is there coolant in the engine oil ? the oil level will be a little higher than normal if there has been coolant getting into motor ? theres also another way that ive seen coolant enter the oil through the intake manifold gasket its tough to decide ehere the leak is , does it run and idle smooth ?
after a long ride in the hot daytime sun after you turn off let it sit for 20 min then pop the hood and with gloves on swueeze the upper rad hose and check if theres pressure in it dont open cap as im shure you know. if there is a coolant leak depending on how bad it is you will notice that there will be very little or no pressure in you upper rad hose need to pressurize the coolant in order to cool engine correctly. well i hope i havent said to much at once , take a close look at all questions and write me the answers maybe we can pinpoint the problem for you
1 rad transmission cooler
2 real bad head gasket or cracked head
3 intake manifold gasket how does it run and idle
anyhow i hope i helped you a little until next time
bye good luck get back to me please

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