1995 four runner radiator issue

Hi all, I'm helping a friend with his SUV. He had the radiator flushed, but the brown sludge has returned. The oil looks perfect and it ran perfectly prior to battery dying. My first time working on a toyota and wondering if it's a head gasket, wouldn't the oil be fouled?

Thanks, Ron

 

Did you flush the whole system or just the radiator?

 

That's a great question! I'll find out!

 

When I drained my broken head gasket oil there were green coolant streaks. Maybe the coolant is just not getting in the oil but the oil in the coolant. Idk

 

Thanks, I had the work done at a local mechanic and is checking to see if the system was flushed. I'm guessing no.