I noticed during an engine check, that the interior color of the engine was golden/brownish on the parts under the oil cap (overhead cam and head interior).
The engine is a turbo with 68000 miles on it. The car has had the scheduled oil changes at the dealership. Is this coloration normal for a volvo turbo? (My other car is a Honda Accord with 170000 miles and the interior of that engine under the oil cap is still shiny silver.)
If this is a problem what is the cause and how can it be corrected, or does the engine require a periodic cleaning.
Any thoughts are appreciated.
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