Question about 1994 Nissan Maxima

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Engine oil so much dirty.color brown,is it possible diluted with radiator coolant???.

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  • Nissan Master
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If it's brown like a chocolate milkshake, then there is coolant in the oil. Otherwise it's likely dirty and needs to be changed. Hope this helps.

Posted on Sep 07, 2010

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Posted on Jan 02, 2017

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Trans fluid ed in coolant bottle did flush and two week brown oily goo in bottle


Flush coolant system again. Do you have a brown sludge in the oil. Do this get Preston coolant flush, drain radiator drain coolant tank, fill radiator with water, add the Preston run vehicle for about 15 min remove lower radiator hose from radiator. This will allow all residue to be removed from engine. Replace radiator hose. Fill radiator with appropriate amount of coolant. Disconnect tank from system and let water run through tank until it is clear. Reconnect tank and you should be good. Unless you have oil and coolant mixed which means a blown head gasket or cracked block

Jun 14, 2017 | Cars & Trucks

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Went to add coolant to reservoir there was oil in it! checked radiator only coolant disconected reservoir from radiator until i get it fixed. think previous owner added oil here. any other ideas?


The way to tell if something is wrong check oil cap. Look for a white foam sometimes it's brown showing coolant in oil also look for white or blue smoke coming out of tailpipe. If you don't see any of these simple drain reservoir and flush it. I would also drain radiator to be on safe side. It is possible that last owner put oil in reservoir I have seen strange things like that and worse

May 06, 2016 | Cars & Trucks

1 Answer

Oil in my water


At least not yet.
As you already know, brown coolant is usually a sign of engine oil leaking into the radiator coolant. Could be a gasket leak such as the intake or a head gasket, or the oil cooler if your car is equipped.
You said the warning light was on, was the radiator coolant level low ?

Feb 10, 2013 | 2002 Audi A4

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The oli is getting into the water but not water into the oil?


Is coolant oil color now pink or brown?

If pink, transmission oil cooler failed.

If brown engine oil cooler failed, oil pressure is higher than coolant pressure.

Check the oil cooler for corrosion internally, problem is common.

Possible head gasket failed or worse, head cracked..

Jan 08, 2011 | 1997 Audi Cabriolet

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Hi my name is Heath. I have a 1990 Ford Bronco. The other day after i drove it home, I pulled in the driveway and turned the engine off. I got out and heard a hiss so i opened up the hood and I saw brown...


A flush and a thermostat is never a bad idea, but it sound like your radiator cap is worn out, not holding pressure, replace it, should have a 16 lbs rating radiator cap.

Aug 23, 2010 | Ford Bronco Cars & Trucks

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Coolant has oil in it. The fluid in the radiator is a brown color . What to do????


get it flushed out and replaced with new coolant but it looks like early signs of a head gasket starting to go .after flushing keep an eye on color if its the same brown color two weeks later you have a bad head gasket.

Feb 10, 2010 | 1995 Buick LeSabre

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I have an 2001 Mercedes-Benz c240...What color should the coolant be that is used in this car. I paid to have it flushed but the coolant in it looks a greenish-brown color...is this right? Not sure they...


Hi. apparently the mechanic did not rinse the contents out completely after the flushing was administered. During the flushing of a radiator, there may be a good amount of debris that will build up, due to the flushing compounds effect on the crude inside the radiator. This is why there should be a rinsing stage to clean out all that is removed, via the flushing procedure. If the rinse is not done correctly, some of the contaminates will be left behind to mix in with the new radiator fluid. The rust/debris will mix contaminate the new fluid that is poured in, thus, causing the brown color you have noticed.

Most radiator fluids will be green, or orange in color, but never brown or greenish brown. This greenish brown will indicate that there is some rust deposited that were not rinsed out properly, after the flushing of the radiator. I would return the vehicle to the mechanic to request a re-flush of the radiator. They should do it for free.


NOTE_ A more serious issue will be a damaged oil cooler. this will cause the same symptoms within the color of the fluid, if your vehicle is equipped with this device. Once the oil cooler has ruptured, it will cause the engine oil to be transfer into the radiator, thus, changing the color of the fluid.

Dec 03, 2009 | Mercedes-Benz C-Class Cars & Trucks

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Low Coolant light comes on, popped hood and checked it, its full but water/coolant is dirty pretty much brown water. what can cause this?


You're mixing coolant and oil. Probably lower intake gasket leak if you're not running hot, otherwise could be head gasket or other issue. Occasionally a cracked core in the radiator will do this too.

You need to have it taken care of, if you have oil in the coolant, you've also got coolant in your oil, the engine will begin to eat itself...

Oct 16, 2009 | 1999 Ford Mustang Cobra

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I changed the thermostat, water pump but it still overheats


The mechanic should check on the radiator and the radiator fan .Also check the cooling fins of the radiator if the cooling fins are worn out then replace them. You should also check if there is a leak in the radiator and then repair the radiator .The radiator fan ,check it also if the the pulley of the fan is working and if not then replace it or repair it.And the engine oil should be check if the engine oil is dirty or diluted then change oil because of sometimes dirty or diluted oil can cause engine over heat.

Sep 12, 2009 | 1991 Ford Econoline

1 Answer

On a 2.5 range rover does the coolant and gearbox oil flow through the one radiator


No the coolant radiator is a sealed system, oil and water do not mix; as far as I am aware manual gearboxes do not have coolers.

If you have oil in your coolant water this will be an engine problem. Check the engine oil is not frothy and caramel coloured.

If your gear box oil is is a brown colour or dirty looking, this is due to water ingress, either through the breather hose or seals, try changing the fluid. If you can check the seals and breaher hose.

Suggest you get a owners manual and Haynes or workshop manual.
There are plenty of free files on line, do a search on Google, Alltheweb, Lycos, etc

Sep 11, 2009 | 1995 Land Rover Range Rover

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