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D16Y7 - Girdle Discoloration

2K views 18 replies 13 participants last post by  Icarus 
#1 ·
Recently I cleaned up the outside of the engine block and took off the oil pan. There seems to be some discoloration on the girdle:



Is this a sign of abnormal heat damage? Should I be worried about this or is it just normal wear and tear?
 
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#15 ·
Aluminum doesn't change its color at any temperature. Even fully melt liquid aluminum is just matte grey in color.
 
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