Zero impact, use collant and a anti-rust water pump lubricant and you will be very happy
__________________
Jerry
2004 SL500 Black 55K Miles 
2002 s500 Black 90K Miles 
1986 300E Gold 233K Miles
1966 Twin Cessna 320D
1989 Jeep Cherokee 233K Miles
1994 Ford Van E150 399K Miles
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