My car heated up on me a couple of days ago. It was low on coolante so I added some to it. I haven't driven it since than. Its kind of bothered me that It was low on coolante and I have no idea where its going. Today I went out and checked the oil and its thick and brown. I checked the coolante resovoire and it full of what looks like sludge. The car starts and seems to run fine.

MToday I went out and checked the oil and its thick and brown. I checked the coolante resovoire and it full of what looks like sludge. The car starts and seems to run fine.Hello b:

Yes, it runs. But it is NOT being lubricated. You have a blown head gasket, and your coolant and oil are mixing. Get it fixed NOW.

excon

Hello b:

Yes, it runs. But it is NOT being lubricated. You have a blown head gasket, and your coolant and oil are mixing. Get it fixed NOW.

excon

Exactly right, you have water in the engine oil.

I have seen it turn into Pudding like substance, can't be good. Could be Gasket or cracked block or other.

What happens if u don't get it fixed right now?

What if it don't get fixed right away

What happens if u dont get it fixed right now?

You will further damage the engine to the point where it may no longer be repairable, if it's still repariable now...
It is almost always less costly to repair now than replace later. Plus, you don't know where it will fail. You could be left walking in the rain.