Engine oil pressure was fine on my 750 hour 2008 912 but due for an oil and filter change. Two days ago I drained the oil after "burping" the engine and changed the filter with a rotax filter and Aero Shell Sport Plus 4 as I have used in the past.  I did not open the oil tank or disconnect any hoses. On start up I had normal oil pressure very quickly. During run up after reaching operating temp the oil pressure actually dropped and was dropping below the green on the gauge.   Never did that before. .  Upon returning to idle it increased to normal.  I did not run it any more that day. Two days later I checked the oil and was surprised that the level showed on the dipstick without burping the engine.  I have not started the engine since for fear of restricted oil flow.  Any thoughts on the possible cause?

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