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Old 11-16-2012, 06:47 PM   #1301
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I am organizing my garage and I have several gallon jugs of motor oil. Does it go bad if it's been sitting around a while? Should I get rid of this old but unused oil or could I keep it an use it? Also, if I have two half gallons of 5w 20 can I combine them into one container or not. They are different brands.

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Old 11-16-2012, 06:51 PM   #1302
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They should still be good if the seals aren't broken. Don't mix em.

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Old 11-16-2012, 06:58 PM   #1303
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I am organizing my garage and I have several gallon jugs of motor oil. Does it go bad if it's been sitting around a while? Should I get rid of this old but unused oil or could I keep it an use it? Also, if I have two half gallons of 5w 20 can I combine them into one container or not. They are different brands.
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They should still be good if the seals aren't broken. Don't mix em.
They're fine, you can still use it. You can mix it as long as it's the same viscosity.
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Old 11-16-2012, 08:47 PM   #1304
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They're fine, you can still use it. You can mix it as long as it's the same viscosity.
Even if the seal is broken? Someone told me oil "oxidizes" if it sits around and that you shouldn't mix different brand names of the same viscosity. Something about the detergents in them.

So, I am going to combine all like viscosity. I'm telling you. I am making good headway in this blasted garage and I can't wait to be done. Then I have about 4 different projects to start on in the house. I figured I'd do the garage before winter and work in the house when it's colder out.
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Old 11-17-2012, 02:19 AM   #1305
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In general, liquid lubricants(not greases) will remain intact for a number of years. The main factor affecting the life of the oil is the storage condition for the products. Exposure to extreme temperature changes, and moisture will reduce the shelf life of the lubricants.

It is important to note that engine/motor oil, and transmission oil industry performance requirements are changing rapidly. The product may be stored three years and still be intact, but may not meet the latest specifications for your vehicle.

As a general rule, the simpler the oil formulation, the longer the shelf life. The following is a guideline under protected conditions:

Product Shelf Life
Base Oils, Process Oils Three(3) years
Hydraulic Oils, Compressor Oils, General Purpose Lubricating Oils Two(2) years
Engine Oils and Transmission Oils Three(3) years
Industrial and Automotive Gear Oils Two(2) years
Metal Working and Cutting Oils One(1) year
Greases Two(2) years

The following are signs of storage instability in a lubricant:

Settling out of the additives as a gel or sticky liquid
Floc or haze
Precipitates/solid material
Color change or haziness

Water contamination in a lubricant can be detected by a "milky" appearance of the product.

A sign of grease deterioration is the separation of the liquid oil from the solid grease

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Old 11-17-2012, 04:37 AM   #1306
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^^^^
Good post.
The oil in my truck gets milky just on the filler cap. I just get it hot and run it with the cap off a few minutes to evaporate the moisture.

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Old 11-17-2012, 10:09 AM   #1307
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Originally Posted by Cinderocka1989 View Post
In general, liquid lubricants(not greases) will remain intact for a number of years. The main factor affecting the life of the oil is the storage condition for the products. Exposure to extreme temperature changes, and moisture will reduce the shelf life of the lubricants.

It is important to note that engine/motor oil, and transmission oil industry performance requirements are changing rapidly. The product may be stored three years and still be intact, but may not meet the latest specifications for your vehicle.

As a general rule, the simpler the oil formulation, the longer the shelf life. The following is a guideline under protected conditions:

Product Shelf Life
Base Oils, Process Oils Three(3) years
Hydraulic Oils, Compressor Oils, General Purpose Lubricating Oils Two(2) years
Engine Oils and Transmission Oils Three(3) years
Industrial and Automotive Gear Oils Two(2) years
Metal Working and Cutting Oils One(1) year
Greases Two(2) years

The following are signs of storage instability in a lubricant:

Settling out of the additives as a gel or sticky liquid
Floc or haze
Precipitates/solid material
Color change or haziness

Water contamination in a lubricant can be detected by a "milky" appearance of the product.

A sign of grease deterioration is the separation of the liquid oil from the solid grease
Thank you. Very informative post. These are kept in my unattached garage which does get some extreme temps on both ends of the thermometer. I will keep them and inspect them before I use them.
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Old 11-17-2012, 12:42 PM   #1308
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There are many "truths" about oil. I seriously doubt most of them are "true", at least not any longer. It used to be said you cannot mix conventional and synthetic oils. Now they are marketing "blended" oils. It looks like that one is off the table.

If you mix a quart of 5W20 and a quart of 20W50 you don't get a half gallon of 17.5W35. You get a half gallon of 5-20W20-50

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Old 11-17-2012, 03:00 PM   #1309
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There are many "truths" about oil. I seriously doubt most of them are "true", at least not any longer. It used to be said you cannot mix conventional and synthetic oils. Now they are marketing "blended" oils. It looks like that one is off the table.

If you mix a quart of 5W20 and a quart of 20W50 you don't get a half gallon of 17.5W35. You get a half gallon of 5-20W20-50
I'm not mixing different weights, I'm just combining like weights of different brands. It seems my youngest son bought new windshield wiper fluid and a butt load of oil every time his car needed a refill or an oil change.

Now that I'm cleaning and organizing the garage, it'll be very easy to see what we have.
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Old 11-17-2012, 06:31 PM   #1310
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Quote:
Originally Posted by winds-of-change

I'm not mixing different weights, I'm just combining like weights of different brands. It seems my youngest son bought new windshield wiper fluid and a butt load of oil every time his car needed a refill or an oil change.

Now that I'm cleaning and organizing the garage, it'll be very easy to see what we have.
I don't think there's anything wrong with mixing different brands. Personally I'm very picky about the oil I put in my truck. You just can't mix different weights as far as I know.
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