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I would start with another CCV I have seem them fail prematurely. I would also replace the dipstick tube, the new ones are improved. The old style is dual wall style that clogs the new one is wide open and is less likely to clog. A clogged dipstick tube would cause excessive oil consumption because the oil has can not drain back into the oil pan.As for the piston rings it is possible but you would need to dry and a wet cylinder leakage test.