W124 radiators are cheap and very easy to replace. I agree with above and just replace at 10 years as preventative maintenance. I’ve had the plastic bits crack apart but they were also the original parts

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1993 e300
1995 e320
1994 e320
2006 s500 4matic
2004 Jeep wj overland
2001 Ducati 748
2004 Honda shadow aero