Definitely head gasket. It is failed between the two cylinders. Since there is not a lot of coolant flow through the head in that area, you probably will not get oil in water or water in oil.
To answer a couple of the other posts.....
There would be no point to doing a wet/dry compression test on something this obvious. The likelihood of two adjacent cylinders BOTH having ring problems is simply nonexistent. Why? Rings do NOT fail all at once. They fail GRADUALLY over long periods of time. And, two right next to each other while the other cylinders are ok??? Come on!!!
As to the head gasket "starting" to go....... There is NO "starting" about it. It is GONE. You simply cannot run a 6 cylinder engine on 4 cylinders for any length of time - too rough running, to much loss of power, and too likely to stall in traffic.
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