If You Had The Choice To Live Anywhere...
ChatterBank3 mins ago
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As you do not say what year your Astra is no one can give you the correct instructions including me!
The first answer does not tell you to make sure the oil is warm so it flows out easier and gives you the wrong location for the filter. You do not apply a thin layer of oil to the new filter thread you apply it to the rubber seal on the filter. you screw the new filter on using hand tightness but get it as tight as you can. It is a waste of time cleaning the dipstick as the new oil will give you false readings, clean it and redip after you top up. After running the engine re dip the level and top up, the level will have dropped.
In the second answer running the oil for 30 sec will not warm the oil at all, drive your car about 5 miles!
If your Astra is around a 1996 model the oil fiter is on the front of the engine crankcase facing forwards, the drain plug is on the rear edge of the sump in the middle.