Depending on the angle you view (inline?) engine blocks the textures change per cylinder.
Yes, we just addressed that yesterday 
will be fixed in the next patch!
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Is that a gold plated cylinder block? 
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Maybe it’s discoloration from severe overheating.
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We put in a Level of Detail setting on all the engine meshes (~70%) less polygons. For the Exporter to use. The Game also now uses them once they get small enough on screen.
Very occasionally, it decides to swap 2 materials on the mesh. So head facing got swapped to the brass plug material.