E5 or E10 fuel any preference and additive addition?

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purple charlie

CCCUK Member
probably been asked before but ... the C4 is my 3rd American but last Trans Am was over 20 years ago
5.7tpi should I be using E5 or E10 fuel? previously unleaded or leaded were the options.
further to this, would it need any fuel additive?

my background is in bikes and have been though the ethanol debate before on them.
 
teamzr1

teamzr1

Supporting vendor
GM did NOT even use fuel system parts that would live with Ethanol until around mid 2010
so the older the vehicle is the more apt that Ethanol will degrade parts like inside fuel tank to fuel injectors

Do not use E10 at all and your stuck using E5 and use products to keep fuel system clean
Your lucky only that in the USA they force E10 and E15 on us ( I only use non Ethanol gas in my C5)

The higher the Ethanol percent is,
the leaner the AFR will be and induce more engine knock and misfires with less fuel mileage
 
teamzr1

teamzr1

Supporting vendor
Your Welcome Charlie

You might want to get yourself a OBD1 scanner that also records your test drives
That way you can see if and how much leaner the engine is running when using E5 or E10
If too lean than cylinder temps are hotter and engine might have knock, could try 1 step colder sparkplug
with a bit shorter gap

Best case long term, is I tune for customers the engine controller (ECM) and make tune adjustments
to be able to handle Ethanol better allowing engine to run and perform better
 
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