oil does not circulate in the cooling system per-say but automatic transmissions do have a cooler built into the radiator that helps keep the transmission cooler. as for engine oil i don't believe that they have cooler built in the radiators. now if you see oil in your radiator that's a whole different story and it's not good.
Yes, engine oil and automatic transmission oil can both get into the cooling system.
Low engine oil can effect the cooling system as it creates additional friction which may be difficult for the cooling system to remove. The oil is designed to both lubricate and cool the internal components.
It will take a few flushings to get all of that solution back out of the to be oil in the cooling system so it probably doesn't have a lot of oil removal capacity.
A broken piston ring can allow oil to get into your cooling system. A bad valve seal can also allow oil into the cooling system.
Once you have determined and repaired how the oil got into the cooling system eg. head gasket , oil cooler, or turbo, you need to thoroughly flush out the cooling system with a chemical cooing system flush and plenty of water.
does cooling system hold pressure?
That's not the question you need to ask yourself. There's not supposed to be any oil in your cooling system, so you need to take your truck to a diesel service and get it fixed.
The cooling system in the 198 Expedition includes the radiator and its reservoir along with the thermostat. This system included an oil cooler as well, depending on the model purchased.
it has a bad head gaskit
Black water coming from the cooling system of a Cat 3208 marine engine could indicate a few potential issues. It may be a sign of oil contamination, possibly due to a failing head gasket or a crack in the engine block, allowing oil to mix with coolant. Alternatively, it could be a buildup of sludge or debris from corrosion within the cooling system. Regular maintenance and a thorough inspection are recommended to diagnose and resolve the issue.
System pressure will run abnormally high, the AC system will vibrate, and you won't get proper cooling.
Oil is used as the x-ray tubes cooling system.