I have used gas with 5-10% ethanol in my M117 powered car with Djet (same as 108) for many years. No problems, but it is a good idea to change out all the rubber fuel lines from tank to engine. And especially the fuel injection rail tubing and the 7.5mm ID injector connectors. Need to use the proper OE tubing or Contitech equivalent.

In carburetors with float valves for example, there is a problem. I have several outboards as well as garden tools. Learned to run them after use until they use up all the fuel in the float chamber and stop. Otherwise the needle shut off valve (with rubber tip seal) sticks to seat and won't let fresh fuel in.

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Graham
85 300D,72 350SL, 98 E320, Outback 2.5