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Old 31st March 2021, 14:57   #51
paulh260260
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Default Update...Colour of drained oil

I've flushed the engine with Wynns and drained and replaced the oil however the old oil looks worrying.

As you can see from the photo its a milky chocolate colour and pretty emulsified

Can we still rule out HGF or is it looking more likely?

Paul
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Old 31st March 2021, 15:06   #52
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I'd say that a milk chocolate colour is pretty normal for engine oil that hasn't been changed for a long time.

Is that a reflection on the surface or something floating?

Simon
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Old 31st March 2021, 15:50   #53
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Quote:
Originally Posted by paulh260260 View Post
As you can see from the photo its a milky chocolate colour and pretty emulsified
Having worked on dispersing 'chocolate mousse' oil spills at sea, I think your description is a bit worrying. By definition, 'emulsified' means an oil and water mixture, whereby one phase (oil) is dispersed in the other, continuous phase (water). Alternatively, the water may be dispersed as microscopic droplets in the oil. From its appearnce, yours looks like the second type, known as a water-in-oil (W/O) emulsion. A simple way to tell if it's emulsified is to heat it until any water it contains starts to boil. So, put a few drops of your gloop onto a piece of kitchen foil or in a tin can and heat it gently with a lighter flame. If it starts bubbling/fizzing/crackling like a fry-up, there's your answer. If it simply gets hotter and hotter, just giving off oil smoke, there's no water in it. (Scientists know this as the Crackle Test. See: https://en.oelcheck.com/analyses/tes.../crackle-test/


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Old 31st March 2021, 16:10   #54
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Originally Posted by SD1too View Post
I'd say that a milk chocolate colour is pretty normal for engine oil that hasn't been changed for a long time.

Is that a reflection on the surface or something floating?

Simon
It was changed a year ago although there has been a lot of short journeys over the last year so hopefully that's the reason for the colour.

The surface has just started to go a little milky as I'd not moved the oil in this container since draining it 20 minutes or so previously.

Looks like bypassing the oil cooler in the next job, but I could do with a how to and I cant find one anywhere.
Any guidance?

Cheers


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Old 31st March 2021, 16:27   #55
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That oil isn’t normal considering it was changed a year ago, short journeys or not it shouldn’t look like that.
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Old 31st March 2021, 18:15   #56
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That oil isn’t normal considering it was changed a year ago, short journeys or not it shouldn’t look like that.
So does it look like HGF could be now more likely ?

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Old 31st March 2021, 21:23   #57
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It could be coolant leakage into the oil via the heat exchanger. Your circulation issue seems to be focussing on that, so it is a likely candidate.


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Old 31st March 2021, 22:06   #58
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It could be coolant leakage into the oil via the heat exchanger. Your circulation issue seems to be focussing on that, so it is a likely candidate.


TC
I hope not TC, replacing the radiator on a car with A/C sounds a pain ( referencing Haynes and RAVE), hopefully its just a blockage that can be cleared.

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Old 1st April 2021, 06:30   #59
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I hope not TC, replacing the radiator on a car with A/C sounds a pain ...l
By "heat exchanger" T-Cut is referring to the oil cooler Paul, not the radiator. If the oil cooler was mixing oil and coolant I would expect you to have serious mayonnaise in the expansion tank. Have you?

If I were you I wouldn't ignore T-Cut's very interesting and informative crackle test. I'd like to hear the result of that.

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Old 1st April 2021, 07:35   #60
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Quote:
Originally Posted by SD1too View Post
By "heat exchanger" T-Cut is referring to the oil cooler Paul, not the radiator. If the oil cooler was mixing oil and coolant I would expect you to have serious mayonnaise in the expansion tank. Have you?

If I were you I wouldn't ignore T-Cut's very interesting and informative crackle test. I'd like to hear the result of that.

Simon
Ah right, different terminology threw me there!!!

There's not a spot of mayo in the expansion tank, it was the oil cap and cylinder that looked like a mayo factory.

Does this now suggest that the oil cooler cannot be faulty and bypassing it is not worth doing? ( or should I still try that to eliminate it from the overheating issue)

I'll try the crackle test later and report back

Paul
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