Some background info- 2007 2.5i, 104,000 miles. I've been burning a good bit of oil between intervals, but no worse than the specified allowance. On my last oil change, I noticed that the oil was low, and also light brown, thin, and a little bubbly. It didn't smell of coolant, but oil doesn't look like that any other way.
Assuming one of the head gaskets is on its way out, I decided to do a compression test. Results are below
Cyl 2- 180
Cyl 4- 180
Cyl 1- 180
Cyl 3- 210
What gives? Do I have oil or coolant in that cylinder interfering with the test? Is the tester reading high and I have 3 low cylinders and one good one? Could one head be torqued down harder in the corner than the others? Am I fine? Should I tear into it anyway?
Any help is appreciated, I'm stumped.