headlights ?

[Nic]

I think the yellowing on the earlier jap import cars is due to the chrome surface constantly reflecting light back onto the inside of the plastic lenses (probably because of the huge chromed areas on these). I've seen plenty of other types jap import cars with plastic lights that do not suffer from this phenomenon.

 

That sounds plausible and could be the reason why the facelift headlights don't suffer from the same problem.