2007 C15 blowby concern

I run a 2007 379 short hood with a C15 625 twin. Last night I parked at a Flying J and let it idle all night, usually I don't cause I have a bunk heater but I didn't want my fuel to gel overnight. When I did my pre-trip in the AM I noticed about a 3 inch diameter puddle of oil underneath of the blowby tube which I've never noticed before. Could this mean big problems? If it's idling for a longer period of time I always bump it up to about 800 rpms, I idled 900 all night. The truck has 888,342 miles and the engine was overhauled around 310k according to the sticker. It was ran pretty hard that day grossing 79.5 across 200 miles of 9% grades but I rarely run it over 1,650 rpms so it's not like I beat the #### out of it

 

I've never had to add oil to it and I've driven about 30,000 miles since I was issued this truck. It's always stayed slightly above the full line on the dipstick. My dad's 475 used to blow smoke like crazy and his head gasket just recently went. He'd have to add about a gallon every 2 weeks or so depending on how much he idled. I always joked with him saying mine was a better engine since it didn't smoke or use oil

 

I thought about kicking it up to a grand but I didn't know if that would be excessive, I'm still a rookie driver. I did idle around 1,100 one morning and all of a sudden I heard my Jake kick on and the rpms shot down. The cruise shut off after about 20 mins. Now when I run my blower or compressor while unloading a tank I have to stick a bolt between my throttle and the bottom of my dash to keep it running around 1,200 lol

 

I'm easy with it when it's cold, I'll let it idle however it wants for a little when I first start it then I'll kick it up to get it warmed up more. I take good care of this truck and engine and don't run it hard I'm just hoping that the oil leakage isn't a big issue. If the engine ends up needing rebuilt they'll probably stick me in an aero cab with a Paccar engine...