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Does Engine Oil 'Go Off'?

Does Engine Oil 'Go Off'?

Author
Discussion

WarChild007

Original Poster:

281 posts

109 months

Sunday 26th August 2012
quotequote all
Hiya, Just had a clear out in the garage and found an opened 5L (got 4.5L in it) bottle of Fuchs Titan Race Pro F 5W 40 oil.
It can only be 3yrs old at the most, does anything happen to oil over time (i.e. separate etc) or would it be fine to use still?

Thanks!


Edited by WarChild007 on Monday 27th August 18:37

HustleRussell

8,877 posts

62 months

Tuesday 28th August 2012
quotequote all
In the absence of more informed contributors, I'd say you've got nothing to worry about. I'd certainly use it unless it has been kept in particularly cold conditions.

ian_uk1975

1,009 posts

104 months

Tuesday 28th August 2012
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I seem to recall 3 years being the accepted figure for engine oil shelf life? That's the figure I generally adhere to.

Pickled Piper

5,908 posts

137 months

Friday 12th October 2012
quotequote all
It has an almost indefinite shelf life. It goes off in a car as it gets the by products of combustion mixed in with it.

pp

vjj

583 posts

141 months

Monday 15th October 2012
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it is also Hygroscopic - which means it absorbs moisture from the atmosphere
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Drop Test b3nxj

1,091 posts

116 months

Thursday 18th October 2012
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vjj said:
it is also Hygroscopic - which means it absorbs moisture from the atmosphere
are you not thinking of brake fluid?

HustleRussell

8,877 posts

62 months

Thursday 18th October 2012
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^ That was my thinking. Even if engine oil did absorb water, it's not going to be in there long once it gets to 110 celcius plus.

KM666

1,503 posts

85 months

Saturday 27th October 2012
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Motor oil absorbs air IIRC and does some form of oxidation. If its sealed and never been opened maybe ok?

Not sure if air absorbancy differs between mineral and synthetic.

Source: Something an ex Mercedes mechanic who was my mechanics tutor once told me to do with why used engine oil is black, it related to the exposure to air and heating/cooling.

Edited by KM666 on Saturday 27th October 23:59

longshot

2,660 posts

100 months

Sunday 28th October 2012
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An Opie Oils fella told me not to worry when I asked a similar question.
He said that oil should be fine upto about 5 years.