After i just changed the oil (was charcoal black) i ran the car for about 10 min on the spot and looked out the back there was residue of gasoline ( the car is modified and has a 3-3.5"" muffler) not sure if this is relavent info ?

Any ideas ? Runnin rich ?

 

Likely just harmless condensation which will disappear once everything is up to operating temp. Your car probably runs rich until then and it's probably cooling off where you live.