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by simon8201 - 09/09/26 01:46 PM
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Wales
by Joske Vermeule, September 1
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Forums39
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Jun 14th, 2026
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Needs to Get Out More!
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Needs to Get Out More!
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All 95 octane petrol in France has been E10 for a while now. When I took delivery of my Mog, the guys at Morgan France recommended that although the motor would run fine on 95 octane E10 petrol, I should always use the 98 octane because of the way the ethanol soaks up water it could lead to corrosion issues in the petrol tank. So that's what I've done.
Giles. Mogless in Paris.
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Talk Morgan Enthusiast
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Talk Morgan Enthusiast
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And as ethanol is being added for 'green' reasons, an encouragement to burn more, not less fossil fuels.
Another example of the law of unintended consequences.
1930 Super Sports Aero 'The Elk'
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water is insoluble in petrol, but soluble in ethanol. This water/ethanol mixture then sinks to the bottom of the tank and the water content causes corrosion in the bottom of steel tanks etc.
So although the ethanol itself doesn't directly cause corrosion, it causes the conditions that can. When I was a boy  we used to occasionally throw a bottle of metho in the tank every so often with the idea that it helped remove the water that was often in the petrol in small quantities. Perhaps it wasn't such a good idea 
Peter ![[Linked Image]](http://bradley.it/public_images/drive.jpg)
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Talk Morgan Expert
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When I was a boy...used to run a splash of meths in the petrol for skidoos in Svalbard because we were constantly filling from jerry cans in all sorts of weather - theory being that the snow that got in to the tank would melt, be dispersed by the meths through the petrol and pass through the engine without killing it rather than building up in the tank till it would make it in one non flammable lump into the cylinders. We had our share of things going pear shaped on the skidoos but don't remember actually having any stopping because of water in the fuel.
We were also running diesels with rather a lot of petrol in the fuel and cooking on Jet A1 which sounds dramatic but is only posh paraffin.
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Talk Morgan Enthusiast
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Adding dry methanol/ethanol/propanol is a known way of dispersing a small amount of water in your car's fuel tank or system. Indeed you used to able to buy cans of it to dry out a fuel system. But when you added it, you were then supposed to go for a big run.
Used this way - for a small amount of water, it does work, but the problems arise when the mixture is not controlled, not in fuel that is then used, but sits in the tank over winter (or May if the current weather has anything to do with it).
1930 Super Sports Aero 'The Elk'
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Talk Morgan Expert
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We weren't terribly concerned about long term life of the machines - lasting to the end of the winter and the project suited us just fine! The skidoos would also burn just about anything once you got them started. Air cooled 2 stroke twins with shrouds round the cylinders to keep them warm and if I remember correctly plastic fuel tanks too.
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L - Learner Plates On
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OP
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Just for fun I've been doing a local survey of the fuel around my home. I've been testing for ethanol using a highly unscientific method copied from a uTube video trying to sell "Ethanol Testing Kits". I just made a mark 1/3rd from the bottom of a thin glass jar and filled it to the mark with water and then topped up with fuel to a mark at the top. Shake it up and hey-presto the ethanol mixes with the water and then the amount the water level rises gives you an idea of the amount of Ethanol in the fuel.
So far I have (in order of the most ethanol to the least..)
1. Shell Unleaded
2. Shell Super Unleaded (or whatever they call it.. Optimax or something)
3. Esso Super Unleaded
4. Esso Unleaded
5. Texaco Unleaded (very little ethanol)
6. Texaco Super Unleaded (none).
Having discovered No 6 I have now lost interest in testing the others.
Oliver S.
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I should mention that in the USA one unscrupulous petrol station was found to have 37% ethanol content by a local vintage car enthusiast who went around testing his local stations!
Oliver S.
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Somewhere on the web there is a resource that lists the Texaco zero ethanol sites, the fuel is not the same country wide and round my way, it does have ethanol in 
1930 Super Sports Aero 'The Elk'
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Just for fun I've been doing a local survey of the fuel around my home. I've been testing for ethanol using a highly unscientific method copied from a uTube video trying to sell "Ethanol Testing Kits". I just made a mark 1/3rd from the bottom of a thin glass jar and filled it to the mark with water and then topped up with fuel to a mark at the top. Shake it up and hey-presto the ethanol mixes with the water and then the amount the water level rises gives you an idea of the amount of Ethanol in the fuel.
So far I have (in order of the most ethanol to the least..)
1. Shell Unleaded
2. Shell Super Unleaded (or whatever they call it.. Optimax or something)
3. Esso Super Unleaded
4. Esso Unleaded
5. Texaco Unleaded (very little ethanol)
6. Texaco Super Unleaded (none).
Having discovered No 6 I have now lost interest in testing the others.
Oliver S. Very interesting. Thanks or sharing.
Richard
1976 4/4 4 Seater
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