2003 Discovery 2 SE7
Been driving my Disco quite a bit lately. I did my weekly under-hood check yesterday and noticed it was quite low on coolant. I added some, and then checked the oil. It was on the low side, so I went to add some. That's when I found some milky deposits and oil in the fill tube. The oil on the stick still looked and smelled exactly like it should. The first thing that crossed my mind after seeing this was of course that my head gaskets are shot. How would I check for a head gasket leak without pulling the heads? If it does need head gaskets, how long can I drive it as-is without screwing anything else up?