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Old 4 Weeks Ago   #11
GeoHorn

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Default Re: Oil change issue

The Wolf is right on the money.

Also, if your oil doesn’t change color or begin to turn dark fairly soon after changing (like 5 hours or so)... then you are using poor quality oil that has no detergent capability (regardless of what you paid for it or what brand label is on that bottle.)
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Old 4 Weeks Ago   #12
D2Cat

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Default Re: Oil change issue

Geo if what you say about oil color is true, how is it you can put a particular brand of oil in two diesel engines and the darkness of the oil is different in equal time used?
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Old 4 Weeks Ago   #13
GeoHorn

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Default Re: Oil change issue

Quote:
Originally Posted by D2Cat View Post
Geo if what you say about oil color is true, how is it you can put a particular brand of oil in two diesel engines and the darkness of the oil is different in equal time used?
The difference between two different engines is the difference between apples and oranges. A better test of the veracity of my statement is if you use different oils in the SAME engine and see which oils turn darker more quickly. Those are the ones with better cleaning capability.

Ill add another anecdote: In the aviation world, Mobil attempted to transfer the technological advantages of their Mobil-1 automotive oils to aircraft. It resulted in aircraft engine failures and expen$ive lawsuits.
The reason? Aircraft use leaded fuel in spark-ignition engines. Synthetic oil is a poor scavenger of some contaminants such as lead. Lead build up in those engines resulted in mechanical failures. (The solution was found to be Synthetic Blends.)

If you find you are using synthetic oils as a replacement for your previous mineral-based oils, dont be surprised to find different scavenging results. (Synthetic oils often appear cleaner because they cant dissolve contaminants and keep them in suspension for the filter to remove. Those contaminants are often found as sludge in the bottom of sumps and passages in many engines.). My point is to be certain that, if you are comparing oils, its important to make ALL the comparisons.... comparable.)

Last edited by GeoHorn; 4 Weeks Ago at 05:58 AM.
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Old 4 Weeks Ago   #14
SidecarFlip

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Default Re: Oil change issue

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Originally Posted by Bulldog View Post
Turning black in a hour sounds a little excessive to me.

Did you drain both sides of the pan when you changed it?

Some oil changes color quicker than others. Rotella will turn dark much faster than what I use.
I sincerely hope that wasn't directed towards me..... I do know there are 2 drain plugs under there. Had the m off many, many times and I renew the copper sealing washers every time as well (available at Auto Zone btw).
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Old 4 Weeks Ago   #15
SidecarFlip

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Default Re: Oil change issue

George... Airplanes don't mow lawns or plow snow or dig holes...lol

I guess they could though (and have in the past)....
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Old 3 Weeks Ago   #16
Magicman

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Default Re: Oil change issue

Quote:
Originally Posted by GeoHorn View Post
Synthetic oils often appear cleaner because they cant dissolve contaminants and keep them in suspension for the filter to remove. Those contaminants are often found as sludge in the bottom of sumps and passages in many engines.
Thank You.
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Old 3 Weeks Ago   #17
mattwithcats
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Default Re: Oil change issue

Quality of the oil filter also makes a difference...
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Old 3 Weeks Ago   #18
SidecarFlip

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Default Re: Oil change issue

From George...

"If you find you are using synthetic oils as a replacement for your previous mineral-based oils, dont be surprised to find different scavenging results. (Synthetic oils often appear cleaner because they cant dissolve contaminants and keep them in suspension for the filter to remove. Those contaminants are often found as sludge in the bottom of sumps and passages in many engines.). My point is to be certain that, if you are comparing oils, its important to make ALL the comparisons.... comparable.)"

I have to say Hmmmmmm

Was at my dealer today and my open station M9 is there getting some R&R and the overhead run. Dennis took the valve cover off while I was standing there and at 4000 meter hours and a steady diet of synthetic (Rotella) diesel oil, the overhead is as clean as when it was new. So no I was pleasantly surprised at the absence of sludge or blowby for that matter. Me thinks she will go 10K hours with no issue.

I was really expecting some but there wasn't any. Like I said, my oil never gets dark between changes, dark brown but never black. In fact none of my diesels turn the oil black. All get fed Rotella T5.
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Old 3 Weeks Ago   #19
JeffL
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Default Re: Oil change issue

Most diesel engines turn the oil dark/black immediately after an oil change due to the high residual amount of oil left in the system. Some engines have more residual designed in than others. Want to see clear oil do a second change 5 hours after the first. Will stay clear for awhile. No real advantage to this just happens.
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Old 3 Weeks Ago   #20
Bulldog
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Default Re: Oil change issue

Quote:
Originally Posted by SidecarFlip View Post
I sincerely hope that wasn't directed towards me..... I do know there are 2 drain plugs under there. Had the m off many, many times and I renew the copper sealing washers every time as well (available at Auto Zone btw).
Why would you think that?

I was just thinking that if the OP didn't drain both sides of the pan that might explain why the oil turned black so fast.
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