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Pull and flush it while you have it out. Replace the o-rings. The only real failure I’ve heard of is the thermostat.
The rings degrade over time. I had the same thing. Replaced the rings 5 years ago, no issues. It’s cheap to do, especially if you plan and do it when you are replacing the coolant.
There are kits on eBay to also re-ring the coolant hoses, but I’d replace those every 100k
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2003 X5 4.6is Estoril Blue
2005 Infiniti G35X
1972 Datsun 240Z
1991 Isuzu Impulse XS Sold
1972 Fiat 850 Spyder Donated
1972 Datsun 240Z Sold
1972 Datsun 510 Sold
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