After an oil change my oil seems to turn black really fast, just a couple of days after, why would this be?

 

what engine? what oil? what daily temps? dude, you need to put a lot more info to get an answer

 

Well DUDE, Ive tried many different brands of oil, plus synthetic and non synthetic and different weights, still always happens. Engine temp never goes past halfway line. engine is a 95 gsr with 100,000 miles. could worn piston rings cause this, i cant think of any other possibilities

 

There is nothing wrong with your oil. Detergents in the oil are there to keep dirt in suspension. Without it dirt would just stick to the walls on the inside of the engine. It sounds like the car wasn't very well maintained when it was younger and now that it is getting regular oil changes the detergents are starting to clear out some of the gunk.