How long does petrol last (Not driving car)?

rick540

///Member
My E39 has mostly been parked for the last two months with a 20Km drive every two weeks to stop the tyres getting flat spots and keep everything working.

On the last drive it was running really rough, but nothing specific I could put my finger on, was better once it warmed up.

Starting to think the 65 litres of petrol in it is getting old now, is there any product I can use to preserve the petrol, I have read about them but can't find in SA.
 
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