Bottled engine oil question

[E90_M3Ross]

Just out of question, let's say a synthetic engine oil has a specified interval of 2 years or 15k miles, whichever comes first. If you buy a bottle for top ups or whatever, how long would that be good for? So, if you bought enough to change the oil and had 2 litres left over (in an opened bottle) and that was kept indoors, how long until that oil shouldn't be used? For example, would it be safe to use that at the next oil change, say 18 months later (where it could then be up to 3-4 years old in total before changing).

Obviously being in a sealed bottle not exposed to heat cycles, fuel etc will mean it'd last an awful lot longer than in an engine, but just curious!

Thanks.

[Rough101]

Synthetic has been tested up to about 8 years from memory.

I suspect it lasts a lot longer than that, there isn’t anything to break it down in an opaque sealed container.

[E90_M3Ross]

Rough101 said:

Synthetic has been tested up to about 8 years from memory.

I suspect it lasts a lot longer than that, there isn’t anything to break it down in an opaque sealed container.

Crikey that's a while! Thanks.

[ThingsBehindTheSun]

Rough101 said:

Synthetic has been tested up to about 8 years from memory.

Would I stick 8 year old oil in a Ferrari? No way

Would I use it in my 13 year old shed. 100%

[Tye Green]

just buy an oil burning shed and top the oil up every week. that way you do a full change every couple of months and no need for "an oil change"

[E90_M3Ross]

Thanks everyone for the input

[GeniusOfLove]

ThingsBehindTheSun said:

Rough101 said:

Synthetic has been tested up to about 8 years from memory.

Would I stick 8 year old oil in a Ferrari? No way

Would I use it in my 13 year old shed. 100%

This is the way.