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02 sensor is your oxygen sensor, 98 chevy astro carries 3 oxygen sensor. i belived your bad sensor is on the passenger side by the exhaust manifold but if not try the drivers side all the oxygen sensor for this van are the same. you need to go under the van to replace it, if is to hard to get it out turn your van for five minutes then turn it off and try again, be carefull not to burn your self. the one close to the catalytic converter is the downstream oxygen sensor ok, good luck!!!!!!
Ontop of the transmission there is a little tube. Its only about 2 inches long and the size of a drinking straw. Use a coat hanger or something simelar and clean it out. This is a pressure vent. They are known for plugging up with dirt and other stuff picked up from the road. Get it clean and replace the seal you should be fine.
Your van is going to take about 4.5 quarts.( If I remember correctly ) But always check the dipstick.
Since your motor have some high miles on it, I would use non-synthetic 10w-30 oil that has the high mileage formula.
Synthetic will cause leaks on an old engine because the molecules are smaller and will go through gaskets easily. High mileage formula will help recondition the gaskets.
there is a gasket on the oil filter .... upon removing the old filter you have to make sure that the old gasket came off .....if not then it stayed stuck in the filter housing . if the old gasket is there , all you have to do is pull it off with pliers !!!