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What to do if my water is mixing with the oil

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Bill Boyd

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What oil is it mixing with. If it is engine oil then have a compression test done to determine head gasket/cracked head. Water ( grey/white colour oil)can also get to the sump from corrosion holes in the timing cover case behind the water pump impellor. If it is oil in the radiator and is pink ,then it will be from a failed oil cooler in the radiator for the transmission allowing transmission oil to get to the coolant.

Posted on Jul 01, 2014

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2 Answers

My 1Rz engine has oil in the radiator mixes with water but not water mixed with oil in the sump and its not overheating its running fine


toyota engine ...typicaly hilux Efi

inlet manifold gasket blown
corroded water jackets on the inlet side

if found to be sound
wont be long before the oil will mix with the sump
try re torque the head bolts as a stop gap
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and not the oil jackets yet



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I am assuming its motor oil and not transmission fluid, right ?
You can have a leaking intake gasket or head gasket and get oil in the coolant without getting coolant in the crankcase.
Same thing opposite. The bigger the leak, the better the chance of getting both at the same time.

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Water and oil mixes together


Check oil by draining. Trans tank on radiator bottom may be oily slick you see if oil pan drained clean. Then trans is probably contaminated with antifreeze and that's what is mixing.

Crack in head passages could link oil and water, if you verify antifreeze and oil mixed in oil pan.

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Hi, i have automatic passat 1999 model and recently water happens to get into the gear box and it control board, i experiences a boom sound anytime the gear is changed, the oil has been changed by the...


If no external leak and the transmission fluid colour looks white, the problem belongs to the automatic gearbox oil cooler. The oil cooler has broke mixing the gearbox oil and coolant causing this milkshake. It's a small radiator core type oil / water heat exchanger. It is cracked inside and transmission oil is mixed with engine coolant. Because the transmission oil pressure is greater than engine coolant pressure, the transmission fluid level drops. See also the coolant colour inside recovery coolant reservoir inder bonnet! It could be like this:

tdisline_495.jpg
The automatic gearbox oil cooler type oil / water heat exchanger (oil cooler):

tdisline_496.jpg
In the picture above the transmission oil pan was removed for oil filter replacement.

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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.

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yes it can mix, also check the timing cover for rubs from the timing chain. this is the common problem with 22r. many mechanics will tell you its the block but they are just trying to make money.

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