when you go to buy the oil filter, ask for the two new "gasket washers" and also the o-ring. They are such a small price to pay for the thing to be done right.
When you torque these down to the proper settting, they will crush slightly. If you try to re-use them in theory you would have to go slightly more on torque to get any"crush" or flow of the metal to ensure a good seal. If you were to keep doing this you my tend to strip out the casting threads. and as far as the o-ring goes they should not be re-used, yes they can be re-used, but they become brittle from the heat of the engine and can tear upon re-installation. that would be a huge delay on pulling it back out and metering in the proper amount of oil. In my opinion of course........ Why risk it? Rademis