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High poressure oil escaping from oil filler cap

Car did suffer a blown radiator 2 years ago and repaired but since then cannot stop oil coming out past the oil filler cap and leaking down side of the motor.
Could it be the vent system ( sump ) or slight cracked head gasket, how much approx to fix

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Posted on Jan 02, 2017

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SOURCE: radiator cap/problems

doo a pressure test ,you might se the leak ,if not then you might have an internal leak,if you start to drive and see lots of white smoke its likely you have an internal leak.

Posted on Oct 17, 2008

  • 76691 Answers

SOURCE: 2001 S80 Volvo Sedan Radiator Leak

go to any good parts store for cars and buy a can of BARS LEAK brand radiator sealant/stop leak, if the leak isn't to bad that will seal it up.
I show that the radiator for your car is around $295.00 new, source
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Posted on Apr 03, 2009

  • 6982 Answers

SOURCE: Coolant turned into foamy grey gunky milkshake, oil level is low

If forced to guess, I'd have to say head gasket...but, could be cracked head also (can't really tell unless you tear it down, but to do the repair, either way that's what you need to do.) If residue was reddish, it could be the trans cooler in the radiator but it's not, so rule out radiator. Make sure you flush out system and change hoses during job ... oil softens them and makes them prone to failure. Even if head does not appear to be cracked, have it checked for warpage, sometimes they twist when overheated. Cracked blocks are rare...I would not be concerned unless engine was frozen during winter.

Posted on Apr 15, 2009

  • 42 Answers

SOURCE: Coolant Leak in 2005 S80 at the Radiator - biodegradable V Cars?

Is the bicycle for when your german car breaks down? PS the plastic radiator tanks, are of a recyclable plastic, go figure!

Posted on Jul 19, 2009

SOURCE: oil coming out of engine oil filler cap even

The engine breather pipe seems to be blocked.
It may also damage the oil seals.

Posted on Oct 27, 2009

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1 Answer

Got milky looking oil under oil filler cap/ ????? 2002 ford escape xlt v6-3.o

if just under the filler cap thats just condensation accumulating wipe it clean if the oil itself is in same condition than have a problem such as blown head gasket

Dec 25, 2016 | Ford Cars & Trucks

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1999 chevy luminapassed smog with flying colors nothing wrong went to change oil it was like a light chocolate color

What is wrong with the oil?

If it looks like chocolate milk then you will have a leak in the cooling system that is allowing coolant to escape into the oil. If your cracked radiator has been replaced and you check the coolant level you will find you will need to top it up.
(Take off the radiator cap when the engine is cold and you might also find evidence of oil that has escaped into the coolant and has attached itself to the radiator cap and the neck of the filler)..

White smoke generally occurs when coolant escapes directly into the combustion chamber not when it escapes into the oil passages in the engine and contaminates the oil.

What you need to track down now is where the coolant is getting into the engine oil which may be through a blown head gasket or a cracked cylinder head or both. If you had a crack in the radiator when driving the car the coolant will escape very fast because it is under pressure. Overheating the engine even for a short while can be enough to cause damage and heating up the engine is unavoidable unless you pick up the coolant leak very quickly.

The first thing I would be doing is to check for a failed cylinder head gasket because I would want to eliminate that as the issue if it has not failed.

In some engine designs coolant can leak into the oil via a failed intake manifold gasket and in that event it is a much simpler repair. I am not sure if that can be an issue in the engine you have fitted in your car but it is something you should check out..

In any event there is a very good video here on ways to identify if you have a blown head gasket. If you do not then you will most likely not have cracks in the cylinder heads either. But one way or the other you need to track down the internal coolant leak as engine oil contaminated with coolant will cause engine damage if not dealt with and the problem repaired..

12 Ways of How To Test Blown Head Gasket Compared PART1

Also you might like to read this............

What to Do When Your Engine Overheats

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Check the dipstick and underside of oil filler cap for signs of oil/coolant mixture(chocolate milk).If so, bad news, you have signs of a blown head gasket. Also make sure your radiator isn't plugged. You can check this by running your hand along the surface of the radiator when warm, with the engine off of course. You should not feel any cold spots. I'm assuming your cooling fan(s) are working.

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Loss of coolant is serious because if you allow your engine to overheat you can cause very expensive engine damage - thousands of dollars of damage (not hundreds).

The items that need looking at are:

- Radiator cap is old and faulty. This can allow coolant to escape and needs to be replaced every 4 or 5 years (sometimes sooner) with the correct spec cap - not any old product picked up at some auto store.

- External leak - you need to check all flexible coolant hoses and connections for leaks as well as around the water pump to ensure the WP gasket is not leaking

- Internal leak
The most common is a blown cylinder head gasket which can allow coolant to escape and to get into the cylinders and into the lubrication system. If getting into the cylinders you will see white smoke coming from the exhaust . You need to check the engine oil for coolant contamination as a coolant can escape into the lubrication system via a damaged head gasket. You also need to check the coolant for signs of oil escaping under pressure via the blown head gasket into the cooling system.

An internal leak can also be caused by a cracked cylinder head but if you have this condition are blown head gasket will have probably occurred around the same time.

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1 Answer

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If 'Dissapearing' it is probably a blown head gasket.
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If leaking on the ground, it is most likley a split hose/radiator/pump.
fill the water up, put the cap on, and let the car idle till warm, have the bonnet open, and look for the escaping coolent.

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Sounds like you have blown the head gasket when it got overheated.. The white stuff in the oil cap is emusified oil, a bit like mayonnaise.
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Twice in two years now my Saab 9-5 has had a pin-hole in the oil cooler, which has caused oil to flow into the reservoir. A way to tell is if coolant/oil is coming out of the reservoir cap. The reservoir cap is rated for the pressure of the coolant system, which is significantly lower than the oil pressure. When there is a hole in the oil cooler, oil will be forced out at relatively high pressures, causing the reservoir to fill and then over pressurize and spill out of the cap.

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Which oil is it? Either way it needs to be fixed.

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