Have a 2010 RS. Nothings changed in the last week. Drove a 150 mile ride a week ago, took it today and after 30 min on a warm day... high 80s I noticed backfiring increasing on acceleration and deceleration. Started at third gear but soon it was 1st and 2nd as well. I noticed from first when taking off, it seemed a bit sluggish before backfiring but did not die. No error codes.

Got it home, checked oil which was full but dark.


Could the issue be transmission related or oil because it is darker than normal? Don't want to drive it until I know more.