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Mike Noc · 18th July 2016, 12:25

Maybe they think it will wear out over time - the valve is opening and closing as the crankcase pressures increase and decrease.

18th July 2016, 12:25	#8
Mike Noc This is my second home Rover 75 CDT Manual Connoisseur SE, Rover 75 CDT Automatic Connoisseur SE & a Freelander Td4. Join Date: Jul 2009 Location: Hampshire Posts: 11,550 Thanks: 3,470 Thanked 3,119 Times in 2,247 Posts	Maybe they think it will wear out over time - the valve is opening and closing as the crankcase pressures increase and decrease.