Am checking the state the engine is on MY01 and I started with a compression test. Just a dry test. Engines already hot, injectors off, coils out. I got a reading like

180 - 181- 182 - 205.

fairly rough numbers but you get the idea. The manual states 28 variation max. Its not past 28 but its pretty close. Any ideas?

edit: took off valve cover, has 100,000 miles on and the retainers are still good wtf. Who knows the difference between ap1 and ap1 retainers?? like what do they look like. Spark plugs look good too.

 

My manual says Nominal should be 228 psi, minimum of 135 psi. So it looks as if you have one normal cylinder and three a little lower. Have you checked your valve clearance?
I have not seen AP2 retainers, but I would guess that they look very similar. I'm sure I read somewhere on here (written by Billman250) that AP1 retainers will last fine as long as the engine is not abused or over revved. I have AP1 with 68000 miles and retainers are fine, I checked them just recently.

 

Valve clearance is good, and I looked at a pic and determined I still have the ap1 retainers. i seen a lot of guys who read 180 on there ap1 and its fairly normal. Im being bold and saying the engine is healthy, but wanted a second opinion

 

Any issues in the past with misfires or anything, specifically cyl.4? Could be excessive carbon build up.