Refined oil products (e.g. the stuff you put in your car) go "bad" because they evaporate. In particular, different substances within the fuel evaporate at different rates, so over time the "mix" degrades away from the optimal ratio. If you put old, degraded fuel into your car it can damage the engine.
You can make fuel last longer by storing it in a cool, dark, airtight place, and there are products you can add to make it last longer, but the general rule is that petrol lasts about 3 months and diesel lasts around 6, or at least that's what I've read.
Entropy, sadly, is an immutable and inescapable law of the universe.
You can make fuel last longer by storing it in a cool, dark, airtight place, and there are products you can add to make it last longer, but the general rule is that petrol lasts about 3 months and diesel lasts around 6, or at least that's what I've read.
Entropy, sadly, is an immutable and inescapable law of the universe.