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Any 850 still using the original gray cap should get the green replacement as very cheap insurance. The gray caps split easily and allow depressurization and leakage.
Also check the seams of the radiator where the aluminum fins are crimped to the plastic endcaps. As they age they tend to seep coolant out the seams and leave small puddles under the car after it cools down. They may seep enough to leave white residue for a while without needing replacement, but if it starts to leave puddles from the endcaps you should replace it soon.
Mike H. II '93 854GLT '98 V70
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