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I would expect the fully synthetic base of Mobil One
to prevent oxidation/polymerisation on storage in a sealed container,
let alone the additive package.Check with your most sensitive sense; smell.
Remove cap, waft any vapours towards your olfactory system.
No big lungfull of sniff from open top.
You will know any off-condition odours. -
Provided the bottles are well sealed (i.e. not left open) they should be fine.
mespilus
Brommers
@Dammit
Ok, next question is does oil go off?
The made on date for my Mobil 1 0w40 is 2007 (1 litre) or 2010 (5 litre, of which 4.5 remaining).