Re-ringing a CY - (solid lifter) 1.6TD - with new Goetze rings - all four cylinders but found bottom oil scarper ring missing in one of the packages - I am sure not fault of manufacturer since they had been opened previously - I have honed each cylinder and am ready to reinstall newly re-ringed pistons - my questions is how critical is it to use a new oil scraper ring in conjunction with new upper top rings - can I use a good used one and still be ok since its not a compression ring?