1. Wear and damage of internal engine parts. 2. Damage to metal, rubber, and plastic parts of fuel system. 3. Corrosion of metal parts in fuel system and engine. 4. Deterioration of elastomers and plastic parts. 5. Deterioration of non-metallic materials. 6. Fuel permeation through flexible fuel lines. 7. Drying, softening, stretching and/or cracking of rubber hoses, seals and other rubber components. 8. Oxygen sensor damage. 9. Damage or premature disintegration of fuel pump. 10. Carburetor damage, including clogging. 11. Dirty and clogged fuel filters. 12. Clogging and plugging of fuel injectors. 13. Destruction of certain fiberglass fuel tanks. 14. Removal or fading of paint and varnish (both internal and external parts of engine). 15. Piston/bore failure through knock/pre-ignition. 16. Piston ring sticking. 17. Unsuitable ignition timing resulting in ignition failure. 18. Gumming-up of fuel injectors, carburetors, etc. due to release of accumulated deposits in engine from ethanol alcohol's solvent properties.
E10 Drivability Issues:
1. Engine performance problems, often simply due to lower energy of ethanol-blends. 2. Hard starting and operating difficulty. 3. Hesitation and lack of acceleration. 4. Stalling, especially at low speeds.