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Old 09-28-2020, 08:12 PM   #1
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Oil....

This should be a short topic.
I have about 3 half filled containers of different brands of oil.
All are for the diesel main engine.
They all have the same viscosity.
Is it safe to mix them all together and use in my next oil change?
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Old 09-28-2020, 08:26 PM   #2
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Let imagine you are your engine, and you have 3 bottle of wine half full in front of you. Would you mix them all to make a maybe good bottle of wine?

Depending of what kind of wine drinker you are, you may or may not. If you don't care about taste and have an old iron palate you may not see the difference. If you are a highly trained taster, an athlete of wine you will not like it.

Your engine is the same


L
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Old 09-28-2020, 08:31 PM   #3
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It may be fine but I donít know for sure or not. I only use 1 brand and then stick to it so I donít have odds and ends of oil around. I use Rotella in the diesels and transmissions.
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Old 09-28-2020, 08:36 PM   #4
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Consume them all.
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Old 09-28-2020, 08:36 PM   #5
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Consume them all.
I donít think that would taste very good...
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Old 09-28-2020, 09:50 PM   #6
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Quote:
Originally Posted by OldDan1943 View Post
This should be a short topic.
I have about 3 half filled containers of different brands of oil.
All are for the diesel main engine.
They all have the same viscosity.
Is it safe to mix them all together and use in my next oil change?
Assuming these are gallon containers, is money so tight that you can't buy another gallon and a half of your favorite oil?

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Old 09-28-2020, 10:04 PM   #7
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I donít think that would taste very good...
Well no, but I think he meant the wine Lou mentioned, rather than the oil.
Dan,this problem seems the result of changing oil brands too often. Would you top up with a different brand if needed? Probably, if the specs were the same. Is this so different?
I doubt it`s a question of saving a few $, more using/not wasting some perfectly good oil. Could even be the same oil with different brands.
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Old 09-28-2020, 10:07 PM   #8
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Well no, but I think he meant the wine Lou mentioned, rather than the oil.
Dan,this problem seems the result of changing oil brands too often. Would you top up with a different brand if needed? Probably, if the specs were the same. Is this so different?
I doubt it`s a question of saving a few $, more using/not wasting some perfectly good oil. Could even be the same oil with different brands.
You have to spell it out for me...
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Old 09-28-2020, 10:07 PM   #9
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I've mixed oil with the same rating all my life. Also I got longer intervals between overhaul with my engines.
Often running commercial boats, when moving between ports, the same brand of oil wasn't always available. So you either store a couple brands of oil until it's available again, give it away, or use it. Tugs usually have a new oil storage tank filled from the deck. If you couldn't use the oil you'd have to pump it to a waste oil tank or somehow pump it ashore.
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Old 09-28-2020, 10:11 PM   #10
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All lube oils have a different additive package.
You may have oil w almost none of one kind of additive and too much of another.
So mixing is not ideal.
Dan, are these “containers” Quarts or gallons?
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Old 09-28-2020, 10:25 PM   #11
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Oils have gotten really sophisticated over the last 20 years.Back in the day we would put anything in but not now.In the 70s i worked at a gas station and we dumped anything left in a can and sold it as bulk .Now i save the remainders for lawn mowers and lube for drilling steel and stuff like that .
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Old 09-29-2020, 02:41 AM   #12
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Is it safe? Yes. Desirable? If you take routine oil samples, no. What brand would you list as the base oil? If it were unsafe the manufacturers would have warnings not to mix brands.
Why not save the jugs for a complete change out of the generator 2 times and the last for the next change of the main? Buy an extra quart or two of like kind to complete the change as needed.
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Old 09-29-2020, 02:56 AM   #13
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Originally Posted by Lou_tribal View Post
Let imagine you are your engine, and you have 3 bottle of wine half full in front of you. Would you mix them all to make a maybe good bottle of wine?

L
I have been known to do that on more than one occasion after a pissy lunch leading into pre dinner drinks, a great curry and a selection of cider and reds.(late 80's early 90's, put down the tools for a while and wore a suit and tie and fun a plenty was had)

I'm still here, didn't die once.
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Old 09-29-2020, 04:00 AM   #14
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Read the labels. I think you will find that, assuming the same viscosity, 15W-40 for example, and the same SAE designation, those oils can safely be mixed. Yes, additive packages may be slightly different but that is of no measurable consequence.
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Originally Posted by OldDan1943 View Post
This should be a short topic.
I have about 3 half filled containers of different brands of oil.
All are for the diesel main engine.
They all have the same viscosity.
Is it safe to mix them all together and use in my next oil change?
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Old 09-29-2020, 04:45 AM   #15
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Quote:
Originally Posted by Nomad Willy View Post
All lube oils have a different additive package.
You may have oil w almost none of one kind of additive and too much of another.
So mixing is not ideal.
Dan, are these “containers” Quarts or gallons?
Gallon containers.

I have wondered about mixing additives also but, reading the containers.... they all claim to "meet or exceed" the same standards.
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Old 09-29-2020, 05:19 AM   #16
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And that is my point. If they meet or exceed the standard, then mixing is just fine. Additives then are immaterial.
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Gallon containers.

I have wondered about mixing additives also but, reading the containers.... they all claim to "meet or exceed" the same standards.
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Old 09-30-2020, 05:34 AM   #17
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"I have wondered about mixing additives also but, reading the containers.... they all claim to "meet or exceed" the same standards."

The "standards" are that the oil will function in an engine and give the same lubrication with out harming the engine

The additives can be 15 to 20% of the oil content and there is NO standard that sez you can mix and match from different refiners..

A really early design like a 2 cycle DD from 1930s wont care as long as the oil is CF II, .

The old CD requirement for light truck or farm implement seems happy with whatever is dumped in.

Personally I would never mix brands on a newer engine , the turbos and exhaust system might be at risk.
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Old 09-30-2020, 07:14 AM   #18
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https://www.bobistheoilguy.com/motor-oil-101/
This is probably TMI, but a good rainy day read. Personally, I would mix them. Use them to top up, especially if you have an old motor.
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Old 09-30-2020, 09:10 AM   #19
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The wine comment is so funny. I did just that with 4 part bottles of wine and I still haven't heard the end of it form the buddy wine connoisseur!! In my defense they were all red!
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Old 09-30-2020, 09:20 AM   #20
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I would imagine that the oil lab analysis would be more useful to you if you used the same brand and spec all the time. If you do not do regular oil analysis of your sump oil, then you are the oil-equivalent to that wine heathen Floater where mixing oil would not make any difference.
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