Foam on top of E85 test kit.

Sep 30, 2021
I just received my test kit for E85. I filled like I was told to by the instructions. After 5 minutes it settled at 80. But it has foam looking stuff on top. What is that foam stuff, and is 80 OK to run. First test ,so in a new to this. TIA.


Well-Known Member
Nov 30, 2009
Never had foam , but 80% is fine . Most will not notice a difference down to 65% .