The degree of squeak can get quite loud before it can cause electronic faults etc etc due to sticking open or closed. There is a fix for the noisy ones, a bit fiddly but saves a LOT of $$ because they are able to be dismantled and lubed, this needs to be done reasonably early in the noisy stage as if left for ages they become damaged and unable to be cleaned and lubed. A new valve is quite exxy 
JC
				
			 
			
		 
			
				
			
			
				The Isuzu 110. Solid and as dependable as a rock, coming soon with auto box😊
The Range Rover L322 4.4.TTDV8 ....probably won't bother with the remap..😈
			
			
		 
	
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