The dealer will certainly charge him to look for the foil cap. He will probably write up the RO as Customer Contends he dropped foil cap in engine..........etc. They aren't going to pull the VC for no reason, and will know if someone else took it off.
If there ever is a future issue with engine, bad cam, bearing, whatever they will have an excuse to opt out should they decide to go that route. In all honesty I doubt your buddy has anything to worry about.
Next OCI let the dealer change the oil, if your buddy ever has a problem I'd suggest playing stupid if they even find the foil cap. Say something like, gee I wonder how that got there? JMO
If there ever is a future issue with engine, bad cam, bearing, whatever they will have an excuse to opt out should they decide to go that route. In all honesty I doubt your buddy has anything to worry about.
Next OCI let the dealer change the oil, if your buddy ever has a problem I'd suggest playing stupid if they even find the foil cap. Say something like, gee I wonder how that got there? JMO