Peter,
A good rule of thumb is untreated mixed gas will last about 2 months. After
that it "sours", fouls the plugs, doesn't burn right etc.
I have no idea of the chemical reason for this, I just know I've used this
rule since the USN taught me to mess about with rubber ducks 25 years ago
and it works for me.
MMC
"Peter Hendra" wrote in message
...
On Tue, 03 Apr 2007 09:47:55 -0400, Peter Hendra
wrote:

Hi,
in the back of my mind I seem to recall hearing that the mixed oil and
petrol fuel as is used in outboards "ages"

Can anyone advise as to whether this is correct?

cheers,
Peter

Please forgive my insistence, but can anyone give me any idea how many
months I can keep mixed outboard fuel - petrol and oil.

It's great to know that yes, definitively, it does age but it would be
really helpful for a cruiser such as myself to know;

1. How long I can keep mixed fuel?

2. What happens when it is aged? - Does it become less useable in any
way such as clogging carburetors etc

Thanks
Peter