Exhaust and Oily Substance

[FrenchFry5275]

So yesterday I cleaned out my coolant resevoir tank and added fresh for my 1985 MR2, and earlier that day added 2 quarts of oil. Changed the antifreeze because it got a little hotter than usual when going up a steep hill. The coolant definently needed to be changed and the tank needed a good scrub. So it ran fine up until about a half an hour ago when I noticed a ton of exhaust. I stopped and checked the tailpipe and there was oil or an oily substance around the inside of the pipe. Just curious if I may have dripped something or if anyone knows whats possibly up?

I'm waiting for it to cool down to check the fluids.