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Just use quality R9 or better hoses. Not from ebay suppliers (AFS sell fake hose) but from somebody reliable. That is all I intend doing.
My wifes y2000 mx5 is "not compatible" and yet nobody knows why, and many have been using e10 or whatever in europe with no side effects (bar slightly reduced mpg etc)
The Dolomega's donor car, a Y2k Omega is also "not compatible" with E10! So that's one of the advantages of the conversion (the ability to run on supermarket fuel) down the drain before it's even properly on the road. I'm running R9 hose throughout, but I think the incompatibility is somewhere in the octane rating vs compression ratio area. Earlier Vauxhalls (like my MKIII Cavaliers) had a clever little doohickey in the loom that plugged in and gave a choice of either 91 and 95 ron, or an alternate plug gave 95 or 98 ron. This thing is either a placebo or it alters the map subtly to cope with varying grades of fuel. The Omega doesn't have this choice giver, so probably preset to 95 and that's it. Hence the incompatibility with E10 which, IIRC, is 91 ron, maybe even 87!
If the cheaper E10 delivers poorer gas mileage then that means that the "super" E5 or E0 is less of a burden in terms of expense as you'll get better economy AND performance by using it and none of the risks of other unwanted side effects that we don't know about yet! One I suspect is that E10 will have an even lower temperature of vaporisation than E5. So vapour lock in carbs will get even worse and will probably start at lower ambient temperatures. At the moment, in the UK, it's only a problem in traffic and during infrequent spells of high ambient temps, over about 28 degrees C. So just about bearable if you are patient and avoid traffic jams whilst out on your sunny Sunday drive. E10 will probably change all that!
Steve