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Weird substance floating in coolant
I have worked on many 7.3's and have never seen this before. This is a friends truck and when he brought it to me to replace the GPR with a White Rogwes unit I noticed a layer of something floating in his coolant degas tank. It was about 3/16 inche thick layer. I have seen oil and fuel, but I do not think it is either. I put a sample from the truck in a bottle (left). To show him it wasn't oil I filled another bottle with new coolant and added oil (right). I shook them both up and after everything settled this is what i got in the picture.
It does not smell like fuel, and I am baffled. He did tell me he put bars leak in the truck a while back because he was losing coolant. My question is, What could this be? Could it be the stop leak contaminating the coolant? Thank you for your time. -Jacob
99.5 F-250 4x4, 7.3 PS
State 1 injectors from Rosewood, GT38 (van) turbo, S&B intake, Comp Cam's 910 valve springs, Smith Brothers pushrods, AIH delete TS 6-position chip. Pyro.
2005 front end conversion, 2008 tailgate, taillights, and rear bumper.
Edge CTS monitor, and 4" Exhaust (Manufacturer to be determined).