Usually the front seal on the pump is the issue. The cooler lines can leak as well as the o-ring on the case from the dipstick.

And letting the vehicle idle for that long doesn't really help, I used to but now I just start it up and let the RPMs calm down a bit... then just drive very slow with minimal throttle out of the neighborhood.

You want all fluids warmed up, not just the coolant.

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I'm not a doctor, but I'll have a look.

'85 300SD 245k
'87 300SDL 251k
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