13 hours on a one year oil change

[IslandTractor]

I would imagine that the oil industry does not have a lot of data on the lubrication and additives many years after manufacture. Not a big issue for them as most products are used pretty quickly so not worth doing the formal testing to demonstrate exactly how quickly important parameters of oil deteriorate (if at all). Easier and much cheaper to just slap an umbrella time limit on when pressed. Same issue for many food items etc. The "best by" date just means that they tested it out that far and found no differences from standard "fresh" materials. Does anyone really think product deterioration occurs in convenient 12 month, 24 month or 60 month cycles?

 

[Gale Hawkins]

I think they just leave a lot of crude oil in the ground because it is out of date most likely.

If motor oil did not wear out then someone would be selling recycled motor oil for engine use I am sure.

 

[WilliamBos]

I think they just leave a lot of crude oil in the ground because it is out of date most likely.

If motor oil did not wear out then someone would be selling recycled motor oil for engine use I am sure.

They do. I wish G oil was sold in Canada.

http://www.getg.com/autoOil.php

I think Safety Kleen does also.

 

[IslandTractor]

They do. I wish G oil was sold in Canada.

Green Earth Technologies

I think Safety Kleen does also.

The Castroil website linked earlier today has a discussion of Castroils version of recycled oil. I think they just clean it up and put more additives in.

 

[Midniteoyl]

I think they just leave a lot of crude oil in the ground because it is out of date most likely.

If motor oil did not wear out then someone would be selling recycled motor oil for engine use I am sure.

 

[Midniteoyl]

Valvoline NextGen is recycled oil..

 

[Gale Hawkins]

Thanks Midniteoyl for clearing up the meaning of my last post.

 

[Midniteoyl]

Thanks Midniteoyl for clearing up the meaning of my last post.

Figured you forgot the tags

 

[tomf]

I respectfully disagree, and would phrase the question this way: Does sitting in the crankcase for one year introduce enough moisture contamination to limit the oil's usefulness?

Water In Oil Contamination

Maybe the 1-year recommendation is based on the humidity in Gulf coast states, or cold states, and a longer period is perfectly safe in dry climates.

Following a link Strategies to Achieve and Sustain Dry Oil in the link you provided gives strategies for dealing with water in oil. This is one listed:

"For normally hot-running machines, low to moderate amounts of water can move out of the oil by evaporation through the headspace and vent. The hotter the oil and the lower the relative humidity in the headspace, the faster the water extraction process will occur from evaporation."

I also point you to this link How Does Water Get in Motor Oil that says basically the same thing.

So as long as the engine gets up to normal running temperature, and run for, say, 5 minutes or so at a time, water in oil from condensation isn't a problem.

As an aside, Toyota had a problem with sludging in thier 1MZ-fe engine. One of the causes was numerous trips without the engine getting to operating temperature. Thus preventing moisture from evaporating. This would cause the engine oil to sludge, eventually leading to engine failure.

So, yes, water in oil is bad. But water from condensation is unlikely to cause serious contamination due to the fact that it is routinely purged from the system under normal operating conditions.

 

[greasemonkeyok]

Having experienced the black death in a Toyota engine in the '80's, I learned what was known about the problem back then. One thing that was not intuitive to me was that the additives were critical to keeping the oil in good condition so that it could lubricate and cool properly. Base oil without additives doesn't last long under operating conditions.

Been using full synthetics ever since.