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First thing I would check is the coolant reservoir tank in the engine compartment on the drivers side to make sure it's filled to the correct level. Those tanks can develop leaks over time. Mid 80's is still pretty hot outside and driving in traffic can make the oil temp go up. Do you hear the front radiator fans kick on when the temp gets up higher in traffic? If not, perhaps a fan has died and isn't helping to cool the coolant as well which in turn doesn't help cool your oil as well as it used to. What kind of "higher" oil temps are you seeing?
By the way, the water temp gauge isn't really so much of a gauge as a "dummy light". It won't go past 175 unless there's a serious issue, although the actual water temp goes up and down all the time.
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