Doing a routine oil check (yellow oil light came on) I checked the oil and it was near the bottom of the notch on the dipstick, so I was going to add a quart to get it to the top of the notch. I twisted the oil cap, which was way harder than I remember in the past, and upon pulling it off there was this yellow/brown sludge all over the cap and a little inside the top of the engine... There's none on the dipstick or anything, only the top where the cap is.
I added a quart like I had planned, then I also checked my coolant fluid to see where it was at and it was still at the normal level.
When I backed the car out to get some sunlight over it, I noticed a small puddle of reddish/orange fluid on the ground more towards the passenger side of where the engine was. My car had never had any leaks before, so I have no clue what's going on.
Also, not sure if this is related, but the other day when I got home and out of the car I noticed this weird smell. It was like the smell if you get something stuck in a carpet vacuum for too long -- like a burnt smell. I thought it was coming from the engine area and I checked all my belts, but nothing looked out of place and I couldn't really pinpoint the origin any further.
Any ideas what may be causing all of this? And how much is it going to cost me to fix