I have run the car about 550 miles and noticed this slimy stuff on the radiator cap and inside the radiator. Car runs fine, stays cool at 190 degrees but this has me concerned. I am running the green antifreeze at 50/50 mix. No antifreeze in the oil and the oil level hasn't moved so I don't think it is oil in there. Is this normal from a new engine build or is there something else going on I am missing? Could this be from the chemicals and sealants used in a new build?
At first I thought it might be a head gasket but all fluids are at the proper level. Any thoughts would be appreciated.
