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-   -   Old petrol (http://www.rib.net/forum/f36/old-petrol-71567.html)

mixyblob 01 April 2016 12:56

Old petrol
Just realised I've got 10 ltrs of unleaded in a can which is 6-7 months old.
Is it ok to use this in my 2st 25 Mariner? or just add a bit to each tank of fresh fuel.

Fender 01 April 2016 13:03

I'd mix it with a little fresh, will be fine

The Gurnard 01 April 2016 13:06

I have had three great days using my 3.3hp two stroke mariner this year.. on fuel I mixed 50:1 and have kept since last September. Ran a sweet as always.. its up to you what you do

jeffstevens763@g 01 April 2016 13:30

Stablise it if not sure but should be ok still I have only had trouble after 12 months it was easy when I had a petrol car it got put in there to get home:thumbs:

beerbelly 01 April 2016 14:00

it will be fine

Fenlander 01 April 2016 14:11

I've never had an outboard not start or play up on fuel up to a year old. However it may not run at it's best so I try and mix 50/50 with new and get it used that way.

Must admit one advantage to me with moving to 4-stroke is that we run two petrol cars here and I can put left over fuel in the cars after each trip meaning the outboard is using new fuel all the time.

beamishken 01 April 2016 17:54

I was told the part of the fuel that degrades is the lighter more volatile part which assists cold starting
So my theory is if it starts it's fine

mixyblob 02 April 2016 06:48

Thanks for your replies gents, I think I'll just add a bit of the old fuel to each tank of fresh.
Wasn't sure if the old petrol could damage the engine but you have put my mind at ease thanks.

Sutty 02 April 2016 12:13

Are you sure that boating is for you if you are bothering about 10 of fuel:bang:

willk 02 April 2016 13:09


Originally Posted by Sutty (Post 711190)
Are you sure that boating is for you if you are bothering about 10 of fuel:bang:

It's the age of the fuel that the OP is concerned about - not the volume. The answers apply just as much to the 300L of petrol you probably have lying in your own tank!

The OP may have no conventional way to get rid of unusable petrol (if such exists ;)) - diesel car, electric garden tools...

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