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#1
03-07-2011, 12:38 PM
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Slightly louder PS pump on E420 W210 than I'd like
I do not have a leak and the fluid is topped off. Any suggestion on what to do? Do I need a new power steering pump or should I use another fluid such as Pentosin CHF 11S? What would cause an older PS unit to get noisy?
Thanks!
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2008 S550 2010 GLK350 1997 E420 (retired) 2005 CLK500 (retired) 
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#2
03-07-2011, 01:34 PM
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You could try the MB additive Lubrizol 6178, part number 001-989-61-03.
__________________
MERCEDES Benz Master Guild Technician (6 TIMES) ASE Master Technician Mercedes Benz Star Technician (2 times) 44 years foreign automotive repair 27 Years M.B. Shop foreman (dealer) MB technical information Specialist (15 years) 190E 2.3 16V ITS SCCA race car (sold) 1986 190E 2.3 16V 2.5 (sold) Retired Moderator
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