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Old 18 December 2013, 09:32   #1
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Old 2 Stroke Oil - does it deteriorate?

I have found 2 litre bottles of Yanalube 2 stroke oil in the back of my garage. I guess they must be at least 5 years old from when I had a Yammy 4 2 stroke for my tender.

I know that both petrol and diesel deteriorate with time, but does 2 stroke oil also deteriorate? Would I be risking damage using it on a normally carbureted 9.8 Tohatsu 2 stroke?
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Old 18 December 2013, 11:58   #2
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Wouldn't think so. There's a lot more volatile compounds in fuels that evaporate or break down and cause it to go off; 2S oil is a lubricant, so I wouldn't expect it to deteriorate.

2 stroke oil - shelf life? | Power Sports | Bob Is The Oil Guy


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Old 18 December 2013, 12:03   #3
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From that linked page: "I know oils are blended & all, but it's been in the ground a VERY long time."
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Old 18 December 2013, 12:04   #4
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The shelf life is indefinite.

However, the oil standards have changed over the years; two stoke oil has gotten better and better.

5 - 6 year old oil will be just fine though in a conventional two stroke outboard.
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Old 18 December 2013, 14:42   #5
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Just after using 20 year old Bar&Chain Oil (Chainsaw) i found at the back of the workshop,worked just fine.
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Old 18 December 2013, 14:47   #6
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Originally Posted by Boatnomad View Post
Just after using 20 year old Bar&Chain Oil (Chainsaw) i found at the back of the workshop,worked just fine.
I bet its a damn site better than the wishy washy biodegradable crap you buy nowadays.
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Old 18 December 2013, 15:44   #7
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I bet its a damn site better than the wishy washy biodegradable crap you buy nowadays.
Yes,what i was thinking after buying new oil today,looks a LOT thinner!
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Old 19 December 2013, 03:45   #8
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before I retired three years ago from the distributer of merc/mar. I contacted the factory in Belgium,I was told that at that time quicksilver 2/str oil had a shelf life of five years,wether it has changed now or not I dont know.
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Old 19 December 2013, 04:02   #9
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I have seen Quick silver 2 stroke oil in an unopened & undisturbed can at least 15 years old have no ill effects ( no separation ) ect on the other hand i have seen other cheaper or budget brands where left for a few years in storage undisturbed have separation or globs of additives laying on the bottom of the can , Either way way with a good shake they all got used up eventually with no ill effects .
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Old 19 December 2013, 07:25   #10
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Thank you gentlemen. It seems that the consensus says 'yes, it is OK to use old 2s oil, but check for separation, and give it a good shake'.

Thank you

Peter R
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