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The display always says ok until it drops down to the minimum (assuming the sensor is working ok).
Its not unsualy to burn a bit of oil top to bottom of the dipstick is only 1 liter though check when cold though it can make a big difference.
5-40 or 10-40 fully sythetic but you could always change the whole lot some new stuff and keep the extra but for next time if you ever need to top up agaian.