What is causing my gas discoloration?

[glennj3]

I drained my fuel from the engine area, it came out a cream color with an orange tent. No water separation noted. The wing tanks are clear as normal. I use auto fuel with non ethanol.
I also used Marvel Mystery Oil from time to time in the gas. So that may be what I am seeing.
This is in my Cessna 172, not the Cub.
Thanks for any ideas.

Glenn G

 

[reileyr]

 

[glennj3]

 

[AOP]

 

[AvFlyGuy]

 

[kentsantabarbara]

 

[SkipB]

 

[Timbrown]

 

[nrpetersen]

 

[glennj3]