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My NA8 with around 15k on its engine does this aswel...

the type of oil you're using has a big influence here... what are you using?

Mine does the same but only since it had the Mania 100,000 k service and the elf oil put in. It quickly goes down as the oil warms up. I expect its something to do with the properties of this particular oil. You are not Robninson Crusoe so I wouldnt be worried about it.

my castrol edge 5w30 does the same thing as well... yeah i wouldn't worry about it.

'At cold temperatures, the polymers are coiled up and allow the oil to flow as their low numbers indicate. As the oil warms up, the polymers begin to unwind into long chains that prevent the oil from thinning as much as it normally would. The result is that at 100 degrees C, the oil has thinned only as much as the higher viscosity number indicates. Another way of looking at multi-vis oils is to think of a 20W-50 as a 20 weight oil that will not thin more than a 50 weight would when hot.'

Copied from here ==>> http://auto.howstuffworks.com/question164.htm

J

i work with oil all day long and the most commong is 15 w 40, at 100 deg C (well 99.9 to be exact) the oil has a viscostiy of approx 15 centistokes (dont know spelling but it sounds like how i spelled it) its usually more like 10-13. and at 40 deg C its like 100 or so centistokes so i'm guessing the 15W40 means that at operating temp 80-100 the oild will be between 15 and 40 centestokes. What i;ve read on a lot of material about oil is not what i see in my lab..

Dave

My NA6 has done that for years!

not too worry mate!