hello people , I'm new to the Honda life just bought a 94 integra , I need some advice on brown sludge in radiator cap? Those not look like oil ( I just did tune up the motor oil seem fine , no water in it ) how do I make shure it's a blown head gasket ?( at least that's what I was told ) please help me !
Thank you
Teggy818

 

Thats old coolant residue im pretty sure, it is a 94