I just removed the head and am lapping valves because of timing problem. If I'm lapping valves, do I need to replace my piston rings too or not?
Car: 2010 Passat CC 1.8 TSI, 100,000 km
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Absolutely not. One has nothing to do with the other. If there are reasons to change the piston rings, then by all means change them. Things like blowby and/or oil consumption would be reasons. Not because you pulled the head and are lapping valves.