Question about 1990 Mercedes-Benz E-Class

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Why is there oil in my coolant resevoir,head gasket leak?

1990 300sel.put new radiator in,new hoses.just changed oil,dipstix looks clean,no white smoke,no overheating,small gasket leak?

Posted by dennis gossard on

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Randy Ohler

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Usually a head gasket doesn't leak oil in the radiator. But they can. Most times it is the radiator. They have transmission cooler lines and some times engine cooler lines that run to the radiator. The cooler in the radiator ruptures and oil gets in this way. Since you replaced the radiator, it could just be residue from the oil being in the coolant system. Check the transmission fluid. If it is a pinkish color, change it wit the filter as soon as possible. Transmissions do not like water or coolant.

Posted on Oct 01, 2016

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Brad lawrence

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Sounds like a warped head take to a mechanic have a compression test done. DO NOT USE ANY GASKET SEALER

Posted on Oct 01, 2016

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2 Answers

If its a head gasket shouldnt i have air bubbles in radiator.


No! Air bubbles in the radiator is usually caused by a damaged radiator hose, a leak in the radiator, a faulty water pump or there isn't enough coolant in the system. A blown head gasket usually leaks oil into the coolant and coolant into the oil. It may also run rougher if its leaking from cylinder to cylinder.

Apr 13, 2018 | Cars & Trucks

1 Answer

I have oil in my coolant resevoir


Hmm try changing the oil, flush and fill the radiator.Then see if the contaminant comes back into the resevoir. If you have a cracked, block/head or a blown head gasket the envoy would have white or blue exhaust coming out and would be overheating since oil retains heat. Some other tell tale signs are little steam will come out of your oil filler when u open it.Your oil looks like chocolate milk instead of regular oil when u check it. Try a compression or a leak-down test to find out if your head gasket is blown. Pull the spark plugs see how they look.

(Contaminated water from rust or mineral? dont use tap water when mixing with the anti freeze)

Hope all this helps you

Mar 10, 2014 | 2004 GMC Envoy

1 Answer

Oil in resevoir, and radiator


If you have engine oil in the coolant, probably a bad head gasket leak. Any evidence of coolant on the oil dipstick? A bad head gasket will show up as low compression on one cylinder, or in two adjacent cylinders. So have the compression tested.

Nov 11, 2013 | 1999 Honda CR-V

2 Answers

My boyfriend has a 91 Toyota 4runner v6 SR5. He has replaced the radiator and thermostat. Also he has bled the coolant system several times. The truck is still losing coolant. If he drives the truck...


When engine completely cools remove coolant from overflow reservoir to the cold mark on the reservoir which is the lowest mark on reservoir. If you continue to loose coolant you may have busted block.

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1 Answer

Possibility of a cracked block. how can i be sure/


Vehicles: Any with the above symptoms

A cracked cylinder block will cause either:
(a) motor oil contamination of engine coolant
(b) coolant contamination of motor oil
(c) white exhaust smoke, due to coolant seeping into one or more cylinders.
(d) more than one of the above
(e) all of the above

Oil infiltrating into coolant is easy to see - drain some coolant out through the pepcock at the bottom of the radiator, and place it into a styrofoam coffee cup. Oil droplets floating on top of the green (or orange) coolant are easily seen. Or visualize oil by looking into the top of the radiator through the radiator cap.
Coolant infiltrating into and mixing with motor oil will permanently damage the engine (seizing it up through loss of lubrication), and must be prevented.
A leak from above the front suspension is, as physicians like to put it, "nonspecific", with the most likely cause a water pump seal or hose/hose connection.
A leak from near the fire wall will usually be a heater core hose, or hose connection.
A coolant leak on the same side of the engine as the water pump is a leaking water pump or water pump seal until proven otherwise.

To rule out everythng else, here's the 1999 Honda CR-V Troubleshooting Guide for Coolant Loss/Coolant Leaking:

Priority Action Part Type Cause
1 Inspect Water Pump - Worn, Cracked or Leaking Water Pump, or Water Pump gasket.
2 Inspect Head Gasket - Leaking Head Gasket.
3 Inspect Radiator - Leaking Radiator Hose(s).
4 Inspect Radiator Cap - Worn or Damaged Radiator Cap.
5 Inspect Radiator Hose - Ruptured, Cracked or Leaking Radiator Hose.
6 Inspect Freeze Plug - Leaking Freeze Plug(s).
7 Inspect Intake Manifold Gasket - Leaking, Worn, or Damaged Intake Manifold Gasket.
8 Inspect Water Outlet - Cracked, Leaking or Damaged Water Outlet.
9 Inspect Heater Control Valve - Leaking or Faulty Heater Control Valve.
10 Inspect Radiator Drain Pepcock - Loose, Damaged, or Faulty Radiator Drain Pepcock, or Pepcock O-ring.
11 Inspect Engine (DOMESTIC ONLY) - Cracked Cylinder Block Leaking Coolant into at least one Cylinder, causing white exhaust smoke.

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1 Answer

Engine overheat changed water pump thermastat radeatorfan temp sensor bottom radeator hose what else could it be


blown head gasket,check oil for water in oil,gray milky look,check antifreeze in radiator for color,check exhaust for white smoke or water-coolant if its going out exhaust gasket blown inbetween cylinders,see if pushing antifreeze out of radiator etc.check radiator for leaks pressure test it,cap on radiator bad?

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1 Answer

Why my oldsmobile alero 1999 wont keep water in


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3 Answers

After driving half a mile my 1998 vw polo open air started smoking from engine stopped car and noticed oil on parts that wasnt there previous have not noticed oil underneth before this insident also has...


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3 Answers

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2 Answers

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