I first saw it when I got this car that sat for 3 years under a tree.
I got a negative test for exhaust gases in the coolant.
where else should I look?
thank you, tom

Sludge. This after new oil filter and oil change. The same as I had before oil change.


Testing

After I blew into the tester with a straw. Turned yellow right away.

 

Sounds like the same thing I have. Just going to watch it and see what happens in the hot weather.
thank you!

 

I saw in a BMW forum it could be the PCV? Thank you, tom

 

car had no thermostat it never warmed up to get rid of all that garbage

 

That appears to be nothing more then condensation. You mentioned it sat for 3 years? Was it in a moist area? Not having a thermostat in it, could be a likely cause as it usually evaporates the condensation out through the PCV when it gets to operating temp, and is run at full temp for extended periods. Might be a good idea to pull a valve cover, and see the extent of the sludge. Then decide whether or not to flush it out with some Kerosene, and change the oil and filter again. If it's not excessive, and you drive the car regularly. It should clear up, might take a couple oil changes though.

Jack