Is this the type of oil you've been using?
If so, did the weather become much hotter since the oil change? Or perhaps you had to idle in traffic for a prolonged time, or extra hard driving?
Usually any one of those is all it takes to get the pressure down low, the manual says it's even OK for the idiot light to flash now and then at idle. (Mine did it once with 30 weight oil after a run on track, when I pulled into the pits)
Ahmet
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