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  #11  
Old 12-31-2017, 09:25 PM
kbs2244 kbs2244 is offline
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Default Black oil is better than no oil.

"Black oil is better than no oil. "

I have wondered about this for some time.
Not compressors but automotive.

After many, many years of changing oil in GM engines I got used to the oil being black very soon after an oil change.
Within 20 miles..

I now have had experience with both a 4.6 V8 and 3.8 V6 engines from FoMoCo.
Their oil is still the color of honey when change time comes around.

Has anyone had similar experience?
Is there a reason?
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  #12  
Old 12-31-2017, 10:12 PM
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terry lingle terry lingle is offline
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Check that with chris he is just in the recovery stage from testing that
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  #13  
Old 01-01-2018, 10:43 AM
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Quote:
Originally Posted by kbs2244 View Post
"Black oil is better than no oil. "

I have wondered about this for some time.
Not compressors but automotive.

After many, many years of changing oil in GM engines I got used to the oil being black very soon after an oil change.
Within 20 miles..

I now have had experience with both a 4.6 V8 and 3.8 V6 engines from FoMoCo.
Their oil is still the color of honey when change time comes around.

Has anyone had similar experience?
Is there a reason?
First a question back to you, have you changed brands of oil or have you seen this across all brands.

Engine oil is designed with detergents and dispersants that keep dirt and
debris from depositing inside the engine. When an oil is doing this it will turn
darker in color. So dark or black oil is not a bad thing. If you are running oil
and changing it at the OEM recommend intervals. It should be darker than
when new. If it is not then the dirt is being left in your engine and that is not
good. The filter removes any of the larger particles of dirt and debris. The
smaller particles pass through the filter and remain suspended in the oil.

Also it is a good practice to run your engine and get it operating temperature
before draining the oil. This gets any loose sediment up and in the oil so you
can get it removed from the engine when you drain the oil.


Back to the original post.
The reason, many, most air compressor manufacturers recommend a non-
detergent oil for air compressors is that they generally do not get hot enough
to drive out any moisture from the oil (automotive engine do) also air
compressors have much more condensation problems when compressing air.
That moisture will be absorbed by the detergents and dispersants in the oil.
Wet oil will contribute to corrosion in the compressor head. You can tell 'wet'
as the first sign is hazy appearance.

My guess with Jacks compressor oil being black is corrosion debris in the oil.
My air compressor needs the oil changed and has not been changed in 5-6
years is still clear and bright in the sight glass. I have a Delta compressor on
its second motor but still the first compressor head, I use Mobil Rarus 427.
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  #14  
Old 01-01-2018, 05:42 PM
kbs2244 kbs2244 is offline
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The procedure is the same no matter the make.
Recomended milage.
Warm up the engine and drain.
Change filter.(Always. They are cheap and I am there.)
Re fill.
Almost always Fram and Penzoil 10W30.

I have done it this way for 50 years.
I only have had FoMoCo for the last 7 or 8.
So I never noticed the difference before.

I have never noticed any problems with the black oil in the GM.
They run fine.

I am just wondering why.
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  #15  
Old 01-01-2018, 09:35 PM
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Quote:
Originally Posted by kbs2244 View Post
The procedure is the same no matter the make.
Recomended milage.
Warm up the engine and drain.
Change filter.(Always. They are cheap and I am there.)
Re fill.
Almost always Fram and Penzoil 10W30.

I have done it this way for 50 years.
I only have had FoMoCo for the last 7 or 8.
So I never noticed the difference before.

I have never noticed any problems with the black oil in the GM.
They run fine.

I am just wondering why.
Most of the newer engines have better finish and tighter tolerances than
older engines, not unique to any one OEM. Just better technology. Needed
to be able to run the lower viscosity oils to meet CAFE standards. As a result
less blow-by and combustion by products getting into the crankcase, to some
degree better base stocks used in the engine oil formulations as well help in
keeping the oil cleaner longer, less prone to oxidation than the old Group I
paraffinics.

Glad to hear you change filters with the oil. Please use the viscosity grade oil
your OEM recommends.

I am not a big fan of Fram filters, they are only a bit better than window
screen, but that is my opinion. I tend to run with WIX and Mobil 1 filters.
Champion Labs (Luberfiner, and a few other brands they sell under) are
very good filters as well. Champion Labs does a lot of private label for
OEMs such as Motorcraft and AC Delco.
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  #16  
Old 01-02-2018, 03:08 PM
kbs2244 kbs2244 is offline
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It is not a matter of age or wear, or filter brand.
I no longer have any GM engines.
But I have 3 sons with a total of 4 GM engines.
Two of them the latest SBC, a V6, and a 4 cylinder.
From 40K to 300K miles.
All four have black oil within 20 miles with a verity of filter brands and OEM oil weight.

The 300K engine has followed my described routine since 50K.
It was black before and after.
(The before changes were all dealer done.)

My V8 FoMoCo has 220K and honey colored oil at 5K changes.

I am not complaining, just curious.
The black color is not a factor in wear or performance.
In fact it even helps when looking at the dip stick!
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  #17  
Old 01-02-2018, 05:14 PM
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terry lingle terry lingle is offline
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Myb 6L Gm with about 135,000 miles on it is still honey colored oil at oil change but that may be related to an anal previous owner with an all the best attitude for his baby.
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  #18  
Old 01-03-2018, 10:40 PM
kbs2244 kbs2244 is offline
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Oh well.
I guess I can let my sleeping dogs lie.

If my boy can get 300K with black oil I guess it is working.
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  #19  
Old 01-04-2018, 08:01 AM
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Quote:
Originally Posted by kbs2244 View Post
...OEM oil weight...
WTF does that mean?
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  #20  
Old 01-04-2018, 08:06 AM
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digger doug digger doug is offline
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Quote:
Originally Posted by Shade Tree Welder View Post
WTF does that mean?
He thinks "Dirt is loob"....
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