Compressor problems or worse ???

Ok good morning guys I have a detroit 12.7 60 series with 1.39m miles on it . So recently I realized there is oil underneath my dryer and air with some water like coming out of my hose inside the cab when I spray to clean floor. I started noticing as well I replaced the governor and it takes a bit to build up pressure to 150 and at times even going down the road at 1500 rpms it stays about 100 and slowly goes up to 150 I also noticed when idling for a while a few drops of oil coming out of the blowby tube. When I purchased the truck they told me it was rebuilt about 3 years ago dont know how true that is but going down oil pressure under heavy load is about 43-50 idling about 20 also im not really having to add oil to the engine not consuming aside from what's normal I've driven over 5k miles and only thing I added of oil was about an 8oz cup which I think it might be normal anyway guys I'm freaking out lol any advice

 

I'm in arizona but pretty much I travel to Houston crazy humidity and back home I did not empty them which I should start doing

 

Will do that today thank you as far as oil under the dryer and drops from the blowby that very well be the compressor itself right

 

That what I thought luckly I found a brand new in the box sealed air dryer when I bought the truck lol but will replace the compressor the dryer and the break valve all new thank you

 

You're right will be emptying the tanks and changing both compressor and dryer along with the break valve and all new fittings might as well thank you guys