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  #1  
Old 08-13-2014, 03:44 PM
Ex Bonanza Bucko Ex Bonanza Bucko is offline
 
Join Date: Jul 2013
Location: San Diego, California
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Default Does oil have a shelf life?

I bought six liters of Aeroshell Sport Four + oil for my Rotax 912ULS and RV12. I note that the bottles have two dates on them which are two years apart. There is no descriptor of the dates.....nothing to indicate what they mean. In my case the latest dates are two years ago.

Does this cause you any concern? If so why?

Thanks,
EBB
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  #2  
Old 08-13-2014, 03:51 PM
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Low Pass Low Pass is offline
 
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It sat in the ground a couple million years. Can't imagine it would last any less in a clean, dry container.
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  #3  
Old 08-13-2014, 04:12 PM
BillL BillL is offline
 
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Location: Central IL
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Quote:
Originally Posted by Ex Bonanza Bucko View Post
I bought six liters of Aeroshell Sport Four + oil for my Rotax 912ULS and RV12. I note that the bottles have two dates on them which are two years apart. There is no descriptor of the dates.....nothing to indicate what they mean. In my case the latest dates are two years ago.

Does this cause you any concern? If so why?

Thanks,
EBB
No cause for concern. Oils with wide viscosity range had some issues decades ago with the VI (viscosity improvers) settling out, but you just drained the containers dry and all was good. I still drain every drop from my containers.

uhhhh, welllll , ahhhh- - - - That is . . . unless you have Aeroshell 50W mineral oil and you can send that old stuff to me for disposal
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  #4  
Old 08-13-2014, 04:20 PM
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Mike S Mike S is online now
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I suspect that the oil does in fact have a shelf life, but I doubt you will live long enough to reach it.

Probably not your grandkids either
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  #5  
Old 08-13-2014, 04:37 PM
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flightlogic flightlogic is offline
 
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WARNING- my stored Aeroshell will expire in 3843. April 15th to be precise.
On a serious note though.... I am amazed (for over 30 years) at how much our flying engines cost to fix up when sick.
Then I look at the oil change habits of owners. If they spent a little now, with frequent clean oil.... I think that expenditure might pale against the overhaul shop invoice. 25? 30 hours ?
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  #6  
Old 08-13-2014, 04:43 PM
paul mosher
 
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Default good till

If it had a shelf life there would be a expiration date.
Feds would mandate it.
Are you just trying to be silly? Do you have a warehouse full of oil?
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  #7  
Old 08-13-2014, 04:45 PM
Dave12 Dave12 is offline
 
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Apparently the AeroShell Sport 40 does have a expiration date. A couple years ago I got a great deal on some because it was expiring according to the date printed on the container.
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  #8  
Old 08-13-2014, 05:43 PM
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plehrke plehrke is offline
 
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Quote:
Originally Posted by Dave12 View Post
Apparently the AeroShell Sport 40 does have a expiration date. A couple years ago I got a great deal on some because it was expiring according to the date printed on the container.
I bet the date is just a lawyer thing to maybe wiggle out of some sort of long term liability. Either that or marketing hoping a few will pitch it and buy new thus selling more oil.
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  #9  
Old 08-13-2014, 05:50 PM
paul mosher
 
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Default retest

Actually Shell documentation states that oil should be tested after4 years.
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  #10  
Old 08-13-2014, 06:11 PM
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Mel Mel is offline
 
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We had a Shell Oil Rep present at an EAA meeting once.

He said that they put a date for retesting, but it was primarily a liability issue. He said that when people have it retested, it never fails.
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