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Hi ya,
I have a 94 N/A 850 and i did have this type of symptom you describe on the head of the engine. Its not a porblem its the lacquer that is applied to the engine to stop the corrision. It dulls over time and crack in places.
I initially tried cleaning it with resin polish but i didn't get far. After seem a friend's 960 who had totally polish his inners i decided to have ago myself. The only problem once you do this is you have to keep it waxed otherwise the polish bit can corrude unfortunately.
Mark.
UK VOC 94 850glt 2l 20v 189k miles
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