Son's car, VW Polo GTI 51 reg. Recently had cam belt change, but garage failed to correctly attach lower pulley. 300 miles later it came off with resultant, to be expected damage. Garage admitted error, removed head and replaced valves. Another 300 miles on and it had used 1.5/2.0 litres of oil. Returned car, head was stripped, new valve guides and seals fitted, seats machined and reassembled (using same valves). 400 more miles and it's used another 2.5 litres of oil (in two top-ups). Prior to cam belt change, oil consumption had been about half litre in 10 000 miles - quite acceptable for 100 000 mile car.
I will return the car yet again, but the problem I now have is that I feel the garage will start quibbling and will no longer accept responsibility for the excessive oil consumption - have changed valves and changed guides (though not at same time) so nothing else we can do.....
The old guides were pretty mashed on the ends and we're distinctly oval - could this have scored/damaged the new valves?
Any ideas what could have happened post cam belt change and subsequent damage? All was fine prior and I just want things back as they were.
Additional info: had gearbox
-out repair at same time as cam belt replacement. Thought this irrelevant, but have done some further reading and am wondering if it's possible that the PCV valve could have been damaged during removal/refitting. The power steering reservoir was damaged and required replacement, so feel there was an element of ham-fistedness going on.
Many thanks, ***** ***** for any advice.