Oil in my water

Brown Milky Oil sounds like your head gasket has gone and coolant water is mixing with engine oil. Unless you have an oil cooler, it may be from there.

You can locate the rattling if you get someone to start it with the hood up.

Thermostat is the wrong temperature range for the vehicle or it is installed backwards. It is opening too soon and not allowing the vehicle engine to come up to operating temperature soon enough. Have system checked, replace thermostat with correct temperature for vehicle

code P0128 :say that the engine is not running normal temp.but less.how the pcm can say that . it's receiving info from coolant sensor. 2things one the coolant sensor is telling the right temp. or the thermostat don't. Change thermostat and see if it change the condition.

Hi looks like your head gasket is gone, check if oil in water or water in oil, oil will go grey in colour, and open rad, when cold, check for signs of oil. But not good symptoms, sorry!

Pls make the following checks with the engine off and cold,
1)Take the radiator cap off.
2) Make sure your hands are clean and dry.
3)Put your index finger into the radiator cap hole for 1 second.
4)Remove your finger and check it for oil.
5)If you get oil on your finger your cylinder head gasket has blown .
6) You must then drain the engine of its oil and water mixture and replace the cylinder head gasket,dont drive the vehicle for it's just gonna make the repairs more expensive for you.

If the oil is white/brown.. Then that means that water got into your oil somehow. If it's running hot then make sure you have coolant in the coolant resivor.

The fact that the oil was low would not be from the oil pump, but from wear in the engine. If it is not smoking when you start it or as you drive, you can probably keep it running by just keeping the oil level checked at each fuel fill-up. As for the car shutting off, you didn't say if the engine seized or got real hot. A low oil pressure problem should have triggered a warning light before the problem got to the point where you lost the engine.

If the car ran after you added the oil, you got lucky and need to always check it.

I have C 240.I have changed the front brake pads.HOW can I reset the computer, as it says "Brake wear go to the workshop"

You have a bad head gasket. You will not know how bad the damage is until the engine is disassembled. Chances are, a head has warped though, and will need to be machined.

I hope this helps you, and I wish you luck on your repair.

Everyone always jumps to head gaskets. There are plenty of MINOR things that can be looked at first.
The Volvo 2.3, 2.4, 2.5 Inline 5 Cylinder dipstick tube is known to develop a large amount of condensationin winter months and stop and go driving. What you see on your dip stick is possibly just condensation. Take off your oil cap and look under the cap and inside the valve cover. Is there any thick foamy oatmeal like substance or noticeable amounts of water? If your oil was saturated with coolant, you would be able to see it up there too. Check your coolant for oil. Volvo coolant is typically brown to orange, however make sure there is no sludge. Start the car with the cap off and keep an eye out for alot of bubbles. A large amount of bubbles is a sign of a bad head gasket. A couple here and there is just air in your cooling system.
Coolant, Transmission fluid, and Oil have several places they can mix. If you have a turbocharged Volvo, the seals in the turbo can go bad and cause a mix of oil and coolant. Your transmission cooler is also in your radiator, and if it cracks your transmission fluid and coolant can mix. I believe turbo models have an oil cooler built into the radiator as well.
Overall if your car sounds fine, you dont see oatmeal, your not using coolant and oil in excessive amounts, dont have white smoke, and your turbo isnt whining you probably just have condensation in your dip stick. If you are overly concerned you can send a sample of your oil to a lab and have it tested for traces of coolant. Headgaskets rarely fail on Volvo's, even the old ones....I have seen many that have gone to replace them have not found a failed gasket and end up finding a bad transmission cooler or a bad turbo.