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Why will some of the plastic covers turn yellow, others in the same box don't?
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Heat is what causes it but the issue goes back to the material mixture used in the original batch formulation for the plastic. It was most prevelant in the 1990s.
 

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Sorry for that. They dont make for a nice display piece but the casting inside is still MIP/B! I have one carded piece we won as a door prize you can barely see inside that another motorcycle collector later picked up for his collection as a loose bike.
 

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It really depends on if you are an Abiogenic or Kerogenic viewpoint believer but the oil was there long before China existed. But I would still blame the algae overall, but then they are not a virus. Hot Wheels collecting can be hard sometimes.
 
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